Well, I've had my GT for over two weeks and slightly over 1000 miles, and I've figured I've had enough seat time to make some observations.
Interior - I'll get to the point - this car is no Honda/Lexus/Aston Martin, etc. If you're a dash molester, you'll probably be disappointed. There's quite a bit of hard plastic surrounding the interior of the car. But it's not too bad, and the guys at Flat Rock did a good job putting it together. The cloth seats (IMO) look pretty good (yes, even the pony print) and give good comfort and support, and have a good range of a adjustment. Steering wheel looks/feels good, but IMO it could be a tad smaller, and I wish it could telescope as well as have up/down adjust. The shifter is shaped well, and the aluminum on the knob is a nice touch; the throws are fairly short, but the shift feel itself can feel a bit notchty/clunky at times (and be mindful of where your pinky is when you shift into fifth, unless you want to have it crushed in between the shifter and console
). Pedal layout is good. Drive-by-wire throttle feels a bit different than the old-fashioned cable-actuated throttle, but not that much. Brake pedal feel is good, but the clutch pedal effort IMO is way too light, and not really progressive; feels too 'all the way in/out' to me. Other than the view over the hood, overall visibility is excellent; no real blind spots to worry about. Trunk space is big enough for groceries, and will hold a Mossberg 590 and AK-47 in their respective soft cases, along with several pistols and ammunition/targets, etc. without a problem. Not going to address rear seat comfort/room, as I won't be sitting back there.
Dash layout is pretty well laid out; the aluminium trim included with the interior upgrade package makes it look a lot more classy than the standard dash trim. The instrument panel and 60's style gauges take a little bit of getting used to, but get intuitive pretty quick. The message center is pretty nifty and handy, and will display your average speed, MPG, fuel efficiency, trip time/distance, and can be used to perform a quick basic diagnostic. The MyColor feature is a neat gimmick, and the gauges really stand out in blue or red, and they're great for making drivers sitting in the next lane at a stoplight go WTF when you decide to change gauge colors, but in the end, it's still a gimmick. The glovebox is big enough to hold a full-size automatic pistol, but that's about it, and it's unlighted (yet my Z28 had such a feature 10 years ago...). HVAC/Radio controls aren't anything special, but they're laid out well enough. I'm not much of a car audio enthusiast, but the stock 160-watt stereo does a good enough job of keeping my ears happy (especially after two months of driving a car with no radio at all!
Drivetrain: It's incredible that this engine can trace it's origins back to the early 1990's Town Car. Around town, this engine has pretty good low-end torque, not as much as my '95 Z28's LT1, but not gutless at all. It's at around 3000rpm is where it really shines, and pulls HARD. And the sound it makes while doing so is awesome. My only real complaint about the exhaust that it's a bit too quiet while cruising and decelerating, and IMO way too quiet at idle. Gas mileage has been see-sawing between outstanding and horrible. My lowest MPG average has been as low as 14.3 in all city, but today I got a surprisingly good 18.9 in all city driving. My best mileage was 32.9 at 50 mph in 5th. On highways at 80-85mph my average was about 21-22mpg. Overall, in mixed driving, I'm getting about 17-18 mpg. Another bonus is that it makes its 300hp/320lb/ft of torque on 87 octane gas.
Ride/Handling: As far as ride goes, it feels just about what it should be IMO, as in it doesn't isolate you from the road like an old Buick, but it doesn't beat the crap out of you either, and feels (and is) much more solid over bumps and rough roads than my Z28 ever was or the SN95 Mustangs I've driven. As far as handling goes, it can easily handle most spots like mall parking lots without a problem, and at medium/high speeds feels pretty nimble and sure-footed for the most part, but the steering itself feels a bit on the light side. Brakes seem well up to the task for city/highway driving. The Pirelli P-Zero Neros seem to be good tires, with quite a bit of grip and not much road noise (they look a bit on the skinny side, though, IMO).
Exterior: Truth be told, when the '05s came out, the styling to me was take-it-or-leave it, but I was surprised that Ford released it while remaining true to the '05 concept for the most part. As time went by, and when I got the chance to look at them close up and drive them, I was definitely hooked on the styling. I've even warmed up to the foglamps a bit, though if there were a delete option, I'd have 'em gone. Overall, IMO, Ford executed the exterior very well, though there are some things I felt they could have done better (and which I will remedy myself in due time
). I thought the spoiler looked completely wrong with the retro theme of the Mustang (fortunately I managed to fix that when I ordered mine
). Also, IMO, the side mirrors look out of place with the rest of the car, and paraphrasing what a MT subsciber thought of them, they look more at home on a Ranger than a Mustang. Furthermore, while it doesn't have the appearance akin to that of a 4x4 as far as ride height is concerned, IMO it could stand to be about 1/2"-1" lower. Also, as stated before, the tires look a bit too skinny for this car. But again, this is all stuff that's fixable without much problem, so I'm not losing any sleep over it.
Well, that's about it. Hope this helps for those interested in a '05/6 Mustang.