Mine has a little wobble to it but the finish has not wore any.. minor scratches.. and I use this mod more than any other.. its my goto..
I was going to get the smok M50, then i heard about problems with the firing button falling off(plus it comes with a rubber replacement at that!!) So I'm glad i got the Siglelei Mini!!
Must just be that particular run, where the wobbly button is concerned. The buttons on my first one (bought it the day they came out basically) were pretty wobbly but the second one I got a month or so later was nice and tight. But comparing the two you can see Sig has been revving things along the way like they did with the Zmax's. Theres a couple minor differences here and there between the first run and whatever run my second one was. The sleeve has definitely upheld better on the second one. My original one got pretty worn rather quickly and its like its stretched out from use and doesnt fit well any more. The second one still fits like a glove!