I own two axes, one standard, one running a boss bolt. I also have a geo2 and a geo3, although i REALLY like axes, when you pick up a geo you know why they cost more money... They simply feel much better in the hands, plus personally i think theyre one of the best looking markers ever made. When youre on the field using them, you dont notice much difference in how they shoot, both rarely break paint and are easily maintained.
My only thing about buying second hand is i hate dirty gear, not everyone looks after their stuff the same way. although if you baught a second hand axe for example youl have an extra £100 or more in your pocket for the sake of 30 minutes cleaning... X