Regular old Z Buzzz's are great, I've had a 172 one for a year and a half, it started out slightly overstable, and after heavy use for over a year not it is really straight with a little turn on a full power rip. I also just got a 177+ tie die Z one, its about the same as my 172 but with less glide (I thought it would be a lot more stable). My latest buzzz is a pink 177+ Ti, I got pink because I heard they're the most stable and I wanted a compliment to my other buzzz. After throwing it a few times in the feild, it definatley is pretty stable, held a 300 foot hyzer into a light headwind. Most of the Ti's are supposedly understable though.