Buyers remorse of HP 48

[pinkman]

My 2 cents:

The 35S, like other RPN models, has a 4 level stack dedicated to calculations.
The RPL models (28, 48, 49, 50) have an unlimited stack dedicated to calculations but also temporary storage. You can let any object on the stack without time or stack limit, and use other objects for new calculations.
The 48S(X) is really slow, as Cyrille said the 48GII+ has a good reputation, and also the 50G of course.
HP Prime is another approach, that I really like because it is (very very) fast, thin, and still supported by HP (even G1 models, but you should consider a G2 if you buy one). But it is absolutely not a RPL calculator, even if its RPN option has unlimited stack. I was born in RPN/RPL but I don't often use the RPN entry mode of the Prime.