Calculators you regret buying?

[Gerald H]

38G - Awful in all departments, only saving graces are functions evaluate correctly (if you can wait),the cover & Sequence App.

Prime - Illegible keyboard, handicapped Sequence App, differentiated environments. Gave up so more detailed critique not possible.

(However, HP excelled in uselessness with the dreadful palmtops

300lx, 320lx, 360lx (I'm a slow learner, stopped buying any more in that series, couldn't really believe they were so useless, thought I'd misunderstood - but no, they are truly junk) & Omnigo 100.)