I agree with the G21 being a bit finicky side to side but I really didn't find it that tough to adjust - any Malibu or Axis is better. It's a bit surprising that people are saying they're similar in size though (not saying they are wrong but that hasn't been my experience). I found the G21 was a lot bigger. To be fair the A22 wasn't loaded up with 4000 lbs of weight but I've also been behind a vlx and a 23 lsv loaded right up and they also seem smaller than the G21 or G23.
Unless you ride the boat until it dies the true incremental cost of the G21 will be less than $25K. I like the Axis but but personally it's Nautique any day.
+1 on the second gen xstar wake being great.