A nice way of getting acquainted with a (new) device is to convert an existing program and get it running. I did so with a program for my HP-29C and ran it on an 11C. It went well, but I was amazed, if not baffled, to notice that the 11C ran at less than half the speed of the 29C. It was the last thing to expect from a 2-generations-younger calculator.
My queens program finds the first solution in about half an hour on a 29C. On both the 20S and 32SII it takes 5 minutes (newer devices), but with an 11C you’ll have to wait for more than one hour. I guess this is the *only* drawback of the latter, but a very important one.
(Off topic: On my Psion Series 3mx it takes a mere 2 seconds, although the programming language OPL doesn’t even really compile, but this one is a real computer)