A couple of times (early on) one set seemed to lose contact with one

The one issue I did have was with my Dinky style guitars and Les Pauls, on several of them the jacks were tight enough that these didn't rotate around while moving, a couple were loser and they did which causes issues with sitting, a piece of velco will solve this, but it's kind of not something i really want to do

I had tried a couple cheap options, which all sounded terrible

I've only had it a couple of months and the transmitter now rattles and feels like it snapped a little open

I've been using these about a month; Used on a 78 Fender P Bass with Semour Duncan quarter pounders (passive) and and LTD B104 with EMG (active

One of the covers fell of during rehearsal, which made me question build quality, but they are pretty sturdy l little units.