I really, really, (seriously) really like the Super pickups and pre on my 535. I have the pickups in the traditional position, which I feel is the best use case (for me, anyway). The coil switching along with the passive tone control gives a lot of tonal options and versatility in both active and passive modes. Having the mids voiced at 400/800 rather than the traditional 250/500/1000 is surprisingly effective.
I still like the traditional electronics package (and have that on my 434). The super electronics are a different thing, but not so different that you lose sight of the fact that it's still got that MTD vibe & sound. Based on my experience, if I was doing a new build, I'd definitely be going with the super electronics.