I bought a 28S in 1989 or 1990 and it's still working. Last year I saw the HP 35s and bought one. I'm still using the 28S even though my battery door is broken as is some of the plastic around the battery door.
The 35s is soooo close to being a great device, but a few things drive me nuts.
The 35s is soooo close to being a great device, but a few things drive me nuts.