What model hub do you have? If you have a C-7, I don't think I'd recommend anything earlier than 2.2.4 (and the version you're on is about the earliest firmware that will even run on that). Many Z-Wave fixes have been made since then, and your experience will undoubtedly be better, especially if you use any devices with S2.
If you're on a C-5 or earlier hub, I suppose it's up to you. If you decide to update and do have problems, there is a way to roll back to previous firmware, as you might be aware of. (Even if you've updated enough times that the specific versions you want are no longer available, there is currently a way to force it to download the latest 2.2.3 or 2.2.4 release--though not 2.2.2.) That plus a hub database backup that you can download yourself should give you a way to go back if you don't like something. But on the other hand, if you don't need any of the new features and consider your setup stable, it's entirely within your control if you want to stay where you are.
Personally, I've updated all of my hubs (I have one of each model) to the latest version and haven't had any problems. In fact, I think around 2.2.3 (maybe it was 2.2.2, but I think that was a bit earlier....) there were lots of under-the-hood performance improvements that really improved things for me. I used to reboot one of my hubs once a week to keep up its speed, otherwise I could visibly notice things like slight lags in motion lighting automations. That is no more. Just one person's experience!