Excellent overall design, extremely simple to take apart, clean and maintain, reliable, sturdy, the list goes on and on. This gun is probably one of the most straightforward designs on the market. It shoots very fast, and has range. It has a great feel to it overall. It is very upgradeable.
You NEED to upgrade the barrel, this is a MUST. It also would not hurt to get the valve modified to more than one hole to eliminate shoot down. This can be done by an airsmith or you can by an upgraded one for anywheres from $25 to $50. It would probably be best to run nitrogen on this gun, CO2 will work, but nitro is far far superior.
With the few upgrades needed, this gun will outperform 90%% of what one might encounter on a typical day of paintball. It will keep up in a tournament as well, but the sophistication of paintball markers in recent years have created better guns, but these go for double the price or more. It is definately worth buying and I would recommend it to anyone who is serious about paintball.