Very strange - I have two Apple watches with two Milanese (is that even a real word?) and haven't had them slip at all.

I find myself adjusting them just slightly throughout the day but I usually write that off as just my wrist expanding and contracting although I'm not playing racquetball with them either. Even when using one of the leather bands (I swap around every few days) I find myself adjusting it a little bit during the day, usually making it slightly more loose.

Not disputing your experience, but any chance it's just daily adjustments? You put it on after a hot shower and then after you cool down it's loose?

The people in the Apple Stores have always been fantastic. Every time I've had to go in I walk in dreading the experience and walk out swearing allegiance. It's great that it doesn't matter where you bought it, if it's an Apple device you can bring it right to their retail stores for service or help, I don't think there are too many places that do that.