I've been BT since June, and the car is my DD.
I wish I had saved my money and bought a different car. gtx2867R, AEM WMI, catless DP, Cobb 3" exhaust. Tial Q, with cold charge pipe. Cp-E FMIC. and I'm barely over 350hp/350tq on Vdyno. I'm still tuning with Stratified and have been since early June. Honestly, I'm about 11k into the car, with everything, suspension, brakes, performance upgrade, racing harness, spare brakes and tires for the track, green filter, brake cooling ducts, pretty taillights, DLR fog lights, etc, etc. and I'm still slower than a stock Mustang. Even the 335I BMW is faster.
Building the car has been fun, and I've met some pretty cool people with a local group (NWST/RS) up here. But, had I known what I was going to get into, then, I would have bought a 5 yr old Z06 for the same price.
Its a fun car, the upgrades such as the BT change the power band. Actually, I've been getting better gas mileage with the 2867r. I think its because I'm not in the turbo as much. Eventually, you get used to the power and of course want more. I've realized I've reached the end of my build. It already has too much power for the track. I spin the wheels while unwinding out of the corners. So, adding forged pistons, an aux fuel system, etc. really isn't worth the effort or additional 5k.
Reliability.. I bought all of my parts new. Last week, the turbo exhaust flange lost 3 out of the 5 bolts, causing the downpipe and flange to come loose from the turbo. I didn't notice it until I started getting headaches from the carbon monoxide entering the cabin. Actually, it was my wife that noticed first. I don't think ATP tightened these bolts at the factory. The AEM system is about 2 months old (brand new) and the tank fuel sensor stopped working. I've also have had to buy a replacement nozzle housing after it clogged so badly that even pressurized air couldn't clean it. The catless downpipe smells... Plain and simple. I guess the catalytic converter has a functional purpose after all. I got used to it, but those unspent gases do find their way into the cabin. The car always smells rich, probably due to the tune and the colder plugs in city driving. It does go leaner at WOT, but downtown, I believe the plugs are fouling. I may go back to the stock heat range and just keep the NGK's for track day.
I'd recommend looking for someone local who has a BT build and see if you can get a ride first.