Finding an IR that I really like is like finding a specific grain of sand on the beach. I can't stand 99.99% of all the IRs that I've tried.
The characteristics I look for are wide bandwidth and minimal comb filtering, especially with distortion tones. Something that sounds up front, balanced, and clear. I haven't found a single one that fits the bill within the unit. And I've bought packs, only to immediately wish I could get a refund after listening to each one.
Smoothing radically increases potential candidates, but I can't bring smoothed IRs into the FM9 without a major headache that just isn't practical considering my time constraints. So for my touring gigs, I can't rely on any IR that needs smoothing.
I'm open to recommendations for IRs that don't sound excessively comb filtered, assuming they aren't too expensive.