I have two of these mics, the first I bought for our banjo player. He clips it onto the tailpiece, and it stays there fairly secure. The second I got for the washboard player. The sound is excellent for the price. Some clip-on mics are silly money, and for 90% of the time, you just wouldn't know the difference. The only issue I've had is with the strain-relief where the thin cable enters the gooseneck. It's just a crimped ring of metal, and the cable pulled straight through it. I dare say the banjo player had stepped on the cable though, so his fault really!It was an easy repair though - it's good as new now. I would guess the first mic has done about 30 gigs by now, so it doesn't owe us much!
When it breaks, I'll probably buy another to be honest. Little mics like this can be considered a consumable in the long term, and this is robust as any other.