I've already got Sonic Charge's MicroTonic, which I think covers what Tremor offers pretty well. MicroTonic also has a tutorial video by Dan Worrall, which automatically makes everything 100% better. The Patternarium is an additional touch of genius which sets MicroTonic apart.
Perhaps this thread isn't the place for it, but I'd be interested in your thoughts on how to best integrate Geist in a DAW. As it has so much sequencing capabilities itself, do you tend to use the DAW to sequence it, or press its 'go' button? I'm in two minds atm, thus far I've been driving patterns across the engines using 8x MIDI tracks rather than let Geist handle the sequencing.