Totally worth it.
If anyone with an AES already has an MVS converter, Uni4 + "banana" cart is hard to beat.
For MVS is just a slam dunk as one doesn't even need a converter.
That instant game switch of the PickNMix is a killer feature, a pity really they didn't cut some of the hacks and included some more original releases (I venture the hacks are "simple" overlay on the actual games so they take little to no space .... just a speculation).
Only pain is the need to go and "fix" the levels of the games but to be fair one can do it as it actually plays them now, no need to do it upfront (I wonder if what we experience in terms of "default banana settings" is a side effect of the flash being set to FF or maybe just random garbage?)