I've had my X45 for over two years, and I've never even given one thought to a "cheap plastic feel". It's just something that's never crossed my mind. (Primarily because at $90, it wasn't as expensive as the Cougar, but I'd hardly call it cheap. They've come down about $20 since I got mine.)
Most importantly, I've done some pretty extreme flying, and I've never broken any of the 18 buttons, dials, etc....
