I found the Giotto to be pretty good - it is a three button computer which certainly makes these changes a lot easier.
I can see its use if you're diving in .eu where rec depth goes all the way to 60 (leonardo's algorithm is "limited to 40m" whatever that means), plus it has 3 buttons. I never understood how that was ever worth its original MSRP, and even now it's a hundred bucks more than the leonardo. A bit steep for the extra 2 buttons I reckon.