What's your favorite non-RPN HP?

[Les Bell]

I don't believe I've ever used one. I bought an 18C for my wife, when her 33C died many years ago, but after flipping quickly through the manual, I decided it wasn't for me.

Even the RPL models don't appeal to me; I admire the orthogonality of the way they work with types like complex numbers, arrays and lists, but that's all just overhead when I mostly want to do a back-of-an-envelope calculation.

So I'm with Didier - the most interesting non-RPN machine would have to be the 71b.