My Xtremes nearly a year old and has ,apart from one day when it went "tits up big style" been very little trouble and requires only light maintainance. As Paul Collier says its no heavier than most other markers,I've no idea how much paint I've put thru it as its had 3 software upgrades and the memory gets wiped each time,(free of charge ,like most of the upgrades
) but i've had maybe 10 chops!!! and I use 2 to 3 cases every time I play,its not too bad on air,but needs a Warpfeed or Halo B to get the most out of it.
Downsides ?,lack of aftermarket custom gear,I even had to have a set of grips made for it as there aren't any ready made,and another problem that I recently found was that it doesn't run too well with large diameter paint,but I've ported the feed out a bit and that seems to have cured it.