GET ONE WITHOUT imo.
If you're an enthusiastic driver, then you only need your right foot to control the power, not TC. I thought it'd be better to get it with so I could switch it off when I wanted. I now switch it off as soon as I've turned the car on. Plus on the 172 its ESP as well as TC and can be vary dangerous imo if you turn into a slide and the car wants to react at the same time. Really don't like driving with it on. I find the car very rarely lacks grip unless pushing it in the wet, which I neved do so its not really needed at all. Its probably perfect if you want a simple drive, ie putting your foot flat whatever the conditions and only turning the wheel once and not correcting a slide.