I've shot the #3 ZT cam at 27" and thought it was very smooth and comfortable. Speed was OK but a little lower than I hoped. I haven't seen a #2 ZT cam yet to compare it to, but the shop nearest me has one on order and said they will call when it comes in so I can shoot them head-to-head. Based on previous experience, I expect the smaller #2 at 27" to be a little less smooth but a little faster than larger #3 at 27".