I'm profoundly deaf in my left ear, and my ENT specialist at OHSU highly recommended a bone-anchored hearing aid. It is a GODSEND for me. I love it so much. The surgery to install the screw didn't take too long, and I was able to recover from it quickly after having undergone 48 surgeries previously before that.
I can say that the bone-anchored hearing aid (a,k.a. "BAHA") is 100 times better than a standard in-the-ear hearing aid, or a behind-the-ear hearing aid. The sound processor itself snaps onto the screw that is surgically implanted into your skull almost like a magnet, and it is so powerful for a hearing aid.
The only downside I've experienced with it is that I've had to change the batteries every other day due to the hearing aid shutting itself off, and then coming back on. I don't know why this is. But, the Cochlear representative that I've spoken with who helped me figure out m,y BAHA sound processor the first month I've had it, had told me that it usually does that because the battery is weak.
The sound processor also doesn't give as much feedback noise as a standard hearing aid would. That's what I love about it. I also have another bone conduction hearing aid similar to the BAHA sound processor that I wear like a headband on my head.