Sure! I'd like to have a CapTel 800i when it becomes available for purchase.
But what I'd like as a bonus is a built-in SIP (Session Initiated Protocol [note: won't work with Vonage/8x8 unless you went with "Asterisk"-friendly provider such as CallCentric as Vonage had increased the price of 500-minute plan from $15 to $18 and 8x8 dropped the Freedom Choice 500 last Friday, which I was currently in before 8x8 switched me to unlimited]) that allows me just an Ethernet connection to the router, which eliminates having a separate phone adapter. Going with just a separate phone adapter with CapTel 800i is no big idea if you have two Ethernet connections and two unused AC outlet, but that'd be a mess for me. (Of course, some phone adapters, including HandyTone 486, do have a LAN Ethernet port, but I'm in for neat and cleaniness. )
Anyway, CapTel 800i is a really neat phone for displaying captions, and I might plan to interface this with my home-based software PBX (trixbox [Community Edition]).