I bought one of these a year ago for my TZ10, and it was fine except that after a while the belt loop broke. This year I've passed my tz10 on to my daughter and got a tz20, so I've bought another of these cases and so far it's been fine. I'm being more careful not to put a strain on the belt loop, but it does seem to be a weak point. Otherwise the case is very sturdy, is the right size for my camera and it's deep enough to put a spare battery in the bottom.
Sadly I have to report that the belt loop has broken on this one too. I shan't buy this model any more!