Yes, mostly, the better clarity is great.
Most of the older units are re-cases as the screen/case was munted anyway. gb, gbc, gba, ngpc, gg
The lynx had screen lines and is the lcd update that I like the most.
The switch, psp, vita, gb micro, ngage are original with good output.
The pce gt is no fun at that screen size so will be updated.
The nomad screen is a bit crap so will be updated.
And well... the wonderswans are unplayable with stock lcd imho.