I got my first Sig just a few weeks ago so I am not super expert on them, but as I do with any firearm purchase I spend hours upon hours researching my purchase before and after I buy something. I have researched, not only the p229 I have, but basically all Sigs in general. From what I have been able to come up with is quality issues, and Sig ,don't go hand in hand. Every manufacturer has a problem once in a while but I have seen much fewer quality issues with Sig than any thing else I have researched so far. Their 1911 had some problems when they first came out but from what I have been able to find recently is those problems have been largely addressed. You may gets some post with different answers but this is what I have seen in the last 3 months of research on Sigs.
It may come from over 15 years of experiencing so many different handguns, both due to my short attention span and the fact I just love to buy sell and trade guns as a hobby, but I NEVER take the advice of the guy behind the counter to mean any more than what the advice cost me. In fact I can't remember when I last asked the advice from some gun counter guy. They have their preferences and prejudices the same as the rest of us, and it is reflected in their advice.