Just my first hello to the forum

[rprosperi]

Welcome to the Forum Pierre. Your penchant for buying nice machines means you will find good company here. Both the 15C and DM42 are great tools/toys for doing unnecessary tasks, they are even handy for some necessary ones as well. Who wants to balance a checkbook with a four-banger when you can do so with a machine that is ready to handle imaginary numbers if the spending gets really crazy.

And though the 50g is certainly capable of far more than a 28S, you can simply use it like a much faster 28S with a much better screen. No need to use all the fancy stuff, just keep having the same fun as you did with your 28S. One interesting thing to do is as you write programs for your RPN machines, follow that up with RPL versions that do the same thing. It's a much better way to learn RPL than trying to learn RPL.