Tell me about Bino eyepieces...

I thought I might try and get some opinions before buying pairs and learn from your experiences. I sold a UO 4mm Ortho to a person in Canada that was using 4mm with his bino. He says he has no problems. How about anybody else? It wasn't really comfortable to view through one for me, much less two. And...what are your favorite eps for viewing planets in a bino? I have a 10" dob for the record.