Good stuff. Although people tend to assume they’re for IEM users on big stages, they’re a great addition to any playing situation.
The battery lasts ages but when it dies the pack starts to cut out now and again (rather than slowly lose power). When you’re totally in the zone, for a second you’re thinking ‘hey what happened’ before you realise the feedback has stopped and it’s like you’ve put the bass down.
I’m also playing at a much lower volume through my headphones when using it because I’m feeling the music as well as hearing it.