I've carried a few Sigs full size and compact. The weight thing is usually from fan boys that can't stand it when you carry anything other than their flavor of firearm. I'm packing around a Sig 938 at the moment and there is no way anyone can call that thing heavy. It's the size of a Bersa 380 for crying out loud
The 229 is a double stack alloy frame that conceals easily. There are others and some poly frame models. It pays to do your own research and find the truth.
A simple truth is there are several styles of Sig Sauer to choose form depending on their niche they are looking to fill.
At the end of the day I have yet to meet a Sig Sauer that didn't hold up to their To Hell And Back Reliability. Are the best gun ever? I don't think so but they are pretty nice. I think the P series especially is an ideal carry weapon in their design. It's no 1911
But they are good pistols.