my bf went from a PS3 to an S4, and from what he said (and what I can see), it's much faster, poppier, very light so it spins FAST, but it also tracks really hard (much more than the PS3 - sometime maybe too much?).
someone correct me if i'm off track....
I used to love my PS3 too, but haven't tried the S4 yet. I bought a riot (which is the same as the lf groove), which i'm loving at the moment. really poppy and ultra soft landings - like - REALLY soft
It can be a bit sketchy, but it suits me.