I'm using these adapters, mainly for headphones in actually all the possible phone in's I have: electronic drum kit; Guitar effect processor; interface; Synthesizer phone in's. I'm also using those adapters with 3 headphones: Vic Firth's, Beyerdynamic's and Superlux's. All of them has different specifications, of course, but all of them works really, really fine with this t.bone adapter. Let's make everything clear with cons and pros.
1. Stable and strong, if the whole cable of headphone are quick and heavily moved, it doesn't have an impact at all for this adapter. What actually shows, that it's an actually high-quality product.
2. The relation between price and quality is really good and fair. It is possible to find cheaper Headphone adapters, pretty much everywhere. But it has no name and no quality at all. Trust me, I've tried tons of cheap 0,49 cents adapters from random sites. It is so not worth it. And this one is actually worth a few euros. So don't save for your work and sound quality.
Honestly, I couldn't find one.
In conclusion, it's simple, good looking, good quality Headphone Adapter. I do believe, that there still are people, which don't trust in brands like t.bone or m-audio or Harley Benton or Millenium etc. Trust me guys, give it a shot. I think these brands are future of studio equipment, cause they actually give you pretty good quality products. Of course, it's not a piece of professional equipment, but it's good.
Would I recommend it? Definitely - YES for all of the users: beginners, advanced, professionals. It's good for gigs, good for practising, good for recording.
Have fun, you guys!