they don't have an imu heater and i think the gyro/acclerometer is lesser quality....... if you get one, make sure to let it sit powered up 5-10 minutes before your first flight. they act all goofy when there cold, taking off in atti can have a lot of different results than your used to with a v.2 or even v.1 with the latest firmwares. all the red ones tend to not self level all the time as well as v.2 does but v.1 will let it go faster if you push it to it's limits
the lites sure have gotten cheap, i saw a controller only the other day at a store for $89, might have been less, i remember double taking it but it's just not something i'd use.... v.2, got a pile of them