I've heard of guitarist's chairs, but I'm old school. Back when I used to frequent guitar shops, they used either small barstools, or guitar barstools. I just use a really comfy Gibralter drum throne. Not the cheapest option, but it serves the purpose.
I just usually slide my computer chair away from my desk, position the drum throne, then plug in the guitar to my amp and toggle through my computer Music playlist for practice or jamming. I really don't sit back with the drum throne, because I'm focusing on my practice regimen. Everything else kind of takes a back seat as I strive to maintain my focus.
Granted, if my guitar chair were a highback cushioned no-arm rocker, I'd really have no place for it in my tiny apartment, unless I'd keep the chair in the bedroom as a seat for putting on socks or soaking my feet. I'd love to build a guitarist's chair, but my carpentry skills are lacking.
One forum member said he was doing exactly this project, a beautiful work of art that when complete will truly be a wonderful piece.