Just to try something new. I've never owned a supersport bike. The Z was great. Had it for almost 3 years. Put a ton of mods and km's on it. Just wanted something more sporty. I don't really have any complaints with the Z at all. It was just time to move on. I'll try the 636 for a season and see how it works out. It's funny that in my 10 years of riding this is the smallest displacement bike I've owned. My wife has an SV650 and she brags that she has a bigger bike than me lol.Why did you get rid of your Z?