No complaints. The puncture system, the clips, all that stuff seems to work well. The pistol is accurate (as pistols go) and makes a very distinctive 'pop' when fired. On the downside, this pistol is expensive. I personally have no problems using this pistol even with cheap paint (weapons grade). But then I don't take a lot of longer shots when I'm playing with this gun either. The basic accessories, like extra clips, are widely available. The important parts, the gas system, the barrel, etc. can all be upgraded.
If you want a semi-auto pistol and are willing to pay this much, it's not a bad product.