Whilst I respect you're views I would have to disagree with regard to complex sequences. I myself have a D110, JD990 as well as a JV2080. With no doubt the least responsive by a long way is the JV2080. The JD990 and D110 can handle anything within their voicing limits.

I find one that when I use fast LFO'S with portamento on four voice patches and drums that timing is extremely slack.

All I would say is that I wonder how new your 2080 is. It may be that Roland have fixed this problem since I and other owners have purchased the synth.

Despite this I have no problem admiting how utterly fantastic the module is in every other way - however since timing is such an important part of music it is extremely disconcerting.