I returned my HP35S this morning with mixed feelings. I was glad to see the last of it and its shortcomings but on the other hand I was sorry it turned out to be so disappointing. When I returned it the person at the store didn't have the slightest interest as to why it was coming back. The last time I took back a calculator was in 1985 when my HP41CX had an intermittent fault in the PRGM / ALPHA switch and the reaction was much different. The store wanted to know exactly what the problem was and no doubt passed the information up the line. That was when you could actually try out a calculator before you bought it as they weren't sealed in plastic sarcophagi.
I'll be watching with interest to see if another model is released by HP and will probably be unable to resist the urge to try it out to see if should keep it or throw it back.
Nick