I have dropped them into my HB TE-40. Never done it before and it took like 5 minutes.
They look nice, but most importantly they work. The screw to "grip" the string holds it tightly and the tuning stability is fine. Not super awesome, but totally fine. Though I play quite aggressively, so that could be a factor.
If you want inexpensive locking tuners that work, these are totally cool.