New to HP prime

[std]

Thanks for your answer.
I mostly use CAS. I want it for structural dynamics exams where a lot matrix calculations have to be carried out. For now I get the job done, but it takes a lot of effort for some not-so-advanced calculations, either because some functions are missing or because of the keyboard layout. I may end up programming a little a bit to do my life easier.
I think that TI Nspire CX CAS would be better suited for my needs, due to the separate character-numeric keyboards, but I was sold for the touch screen of the HP Prime.
I didn't have a chance to hold them in my hand. If I did I may have bought the TI Nspire, who knows ?
However I really like the context help menu.
There are also two things that would make it great, an undo key and an autocomplete feature for the name of the functions.