HP 42S / DM42 vs HP 48-series question

[Luigi Vampa]

HP48: I keep it at home, safe and sound, like NIB. It means so much sentimental value for me!

HP50: I do love the SolveSys library (a solver for systems of non-linear equations), it makes my life as engineer pretty much easier. I keep it handy in my backpack.

Free42: its quick solver on my €33 mobile phone is worth more than gold. My customers get shocked when I am able to provide non-trivial answers on the spot, with no need to run any customized program in my laptop.

My €0.02: if someone tells you to go just for the 'HP xy' for any problem and situation, answer him "all problems seem nails, when you only count on a hammer" :O)