Maybe it's the software and not the RZ? I've been using
the RZ with Rekordbox, but have not really come across many
issues with MacBook Pro. Now I have absolutely no experience
with Serato, but I've heard it is fantastic. If you're used to that near
flawless program then maybe that's why the RZ seems to be unimpressive.
I'm sure that Rekordbox will keep getting better, and surpass other software eventually.
Maybe some SZ users can shed some light on this topic.