Normal,
I have had a MAX for two years now... also a friend in our training group has had his for almost exactly the same amount of time..
periodically you have to adjust the turret, silicone the plungers on the valves, charge it, and keep gas in it... our experience has been very good.. we use them almost daily..
I also have a BB and so far it has been fine also.. I would be hard pressed to give a preference. they each have their advantages..
I will say the people at Etch Marc that sell the MAX's are first rate and very helpful. I understand that BB is getting better in that department.
BB+ sound and throws a higher quality, easier to see bumper.
MAX+ much quicker to set up and reload, dealer/manufacturer