I ordered the Sensaphonics, since their design made sense to me, and there was a local audiologist on their preferred vendor list.
I ordered the 3-driver model (it's a 2-way design, with 2 bass drivers, AFAICT). Anyhoo, I'll report back here with results, if anyone is interested.
Rusty, your thread, so if you'd rather I report elsewhere, I can.