Yeah, I've heard that about those - mine is the CCPM2 - it has never failed. My Special Forces friend shot a few mags through it, and told me "this shoots very, very smooth". So, I stick with it.
Sigs are excellent, Glocks are too, but I'm old school, and want my manual safety. Sigs are more expensive - but the quality is outstanding. I thought to buy a Sig 365, but it didn't come with a safety. It does now, so that might be my next gun. Probably about an extra 300 bucks. Not good about the lack of quality on the other Walthers.