I had a set of the Rockits, briefly. In fact I had a few of them as one-by-one they went back for various reasons.
I think they just had a dodgy batch, or some quality control issues because they were really, really nice but either worked for a while and then made horrendous crackles or they had problems (buzz/rattle) at some frequencies.
I know that the are really good but I couldn't trust them after the third one died. I think they have since been re-worked and are probably the business once again.
I ended up going for a pair of Tannoy Reveals which suit me fine.