I traded a 2015 STI for a 2014 FiST.
#noregrets
But really, like everyone said. Of course the 2015 WRX and STI are all new and way better than their predecessors and blah blah blah, but lag, too much weight and grip, and not enough soul just didn't do it for me. Something about going 80 mph in the city and feeling like you're going 25 just doesn't resonate the same way as lift-throttle oversteering through downtown at 25 mph, laughing like a maniac while nobody notices...
Really, do it. I get 36 mpg on long drives. Did 26 mpg in the Subie, once, with a HUGE tailwind. Normal highway was 22.5. It adds up. The handling, lag-free motor, hilarity of having that much fun in a tiny Ford, and ability to turn it into something so stupidly fast + sharp make it a no-brainer. In subies you add power and pray it doesn't go boom, it the FiST you add power to make it just a tiny bit unbalanced, add coilovers to make it a bit more comfy and sharp, and run "real-world" circles around all the laggy rally cars.
If you track your car less than 5 times per year, the FiST might be the best hot hatch/overamped turbo 4 on the market.