I use a Turbografx-CD combo. I've had the Turbografx-16 for almost 16 years, and the CD attachment for 15 years. Both still work perfectly fine, although I would like to find some way to clean the HuCard port. Heck, the Turbo-CD was actually my very first CD player
. I used to listen to music CDs on that thing, something I never did with subsequent consoles.
Never had a Duo, and while I have a PC Engine/CD-ROM suitcase setup, I seldom use it since I don't play JP HuCards very often (and I just play JP CDs in my Turbo). I also have a TurboExpress, but again I don't play it too often.
Speaking of durability, what's the longest your save games have lasted? I believe the CD unit uses a capacitor for the saves, and while the manual says something like you should turn the unit on every 2 (or was it 4?) weeks to charge it, I had my Turbo-CD in storage for over seven years and when I plugged it in my old Ys saves were still there
.