I think xenobot is great if you spend the time to learn it, I have myself spent lots of time trying to learn what alot of functions do, and how the lua system work.
I've also noticed that it's quite mathematicly, so I learned algebra in a funnier way!
Anyway, back to the point, I would recommend xenobot to anyone, even if you don't have time to make your own scripts there is always scripts to download etc!
Have already got some of my friends to use it, can't wait to see the apophis sytem!