Back to the thread: If you like the AR .22, get one and have fun. If it ain't your deal, fuggedaboudit. Why bother?
But if you like the AR and want to save $$$ in plinking or practicing, it looks like a good way to go. Not particularly my deal, but what does that have to do with anything?
If you're thinking of an AR for defensive use of whatever sort, what's called muscle memory carries over from any AR to any other AR as far as the operation. That's all reflexive. Grip, sights, trigger: Pretty much the same, allatime. What counts is the training of your mind as to varying situations, different scenarios. Mindset, skill set, tool set--in that order.
You're from BATFE? Come right in! I use all your fine products!