I've only been keeping bees for a year now and started off with wired frames with wax foundation as that is what I was told to use by the people selling the gear. After reading about foundationless frames, I have tried some bees with them, mainly just to see what they do. I wasn't sure about wired vs unwired frames either. I already had some wired frames and as some people use wired frames and some don't, I figured it would be fine and would give the comb more strength (stronger for extracting). My only concerns were whether the wires would irritate the bees as they were building, whether they'd take longer to build on foundationless frames (not that it would matter much anyway) and whether the comb would be straight enough and reasonably burr free.
As well as surveying wired vs unwired, it would also be interesting to survey who uses foundation vs foundationless.
I'll be interested to read other people's comments.