I love matt's upgrade. I run full house setup with eco8 aluminum swash, crooked crutch, crazetail2, 7mm main drive, and it is really good setup. tight, great flying stuff. I can do unlimited piros in open space without touching the right stick. (I fly in 30x30 area, and most I got is about 15 consecutive piros while maintaining low level without correcting before getting out of the area) stable, vibration free. Even though I have eolo, I fly my corona more. can loop and roll, split 8, funnel. Collective mods has been out for couple month so far, but I have not heard a review from anybody yet. It still limit you to positive pitch, so no inverted stuff anyway.

lot of corona users hang out at rcgroups.com in electric heli forum... Matt also post there as well. (ballistic technology) and is the place to get the latest before it hits the website...