I have a GR-1 taking up both auxes on my mixer as we speak! I got it for one purpose: live granular after comparing, in great detail, with the package the Iridium offers. Since I decided the live granular was really all I wanted (we’ll see how Iridium’s firmware develops in the future), the pricey GR-1 also saved me money over Iridium while providing much better live granular control.
GR-1 has this drawback in relation to Cosmos: it’s not convenient to use for live play because you devote a lot more attention and energy to it, even in my setup as an FX box. It does a lot, and I only do one thing, but I kind of have to re-set that up every time I turn on the power. Iridium is even more of a dedicated workstation that you basically stay hunched over while you work on it, and workspace, not just expense, makes me not want to do that right now. I’m looking forward to its firmware upgrades, though. Oh yeah, live granular isn’t much with expressive percussion, and I’m thinking Cosmos will provide a lot more there. And as you point out, I also have to add on a USB interface just for GR-1.
At the price, Cosmos looks like a safer bet, the major attraction being the out-of-the-box foot control and overall engineering for easier live interaction with external instruments than the GR-1. I imagine I’ll try it on my auxes for a while to compare with GR-1, but I don’t expect much satisfaction there. As observed above, it’s a niche thing rather than an all-rounder in any sense. If I didn’t think it had significant potential beyond what’s been demoed, I’d be a lot less likely to bother with it. I’m reminded, though, of how good the Lyra-8 can also be when you dial it down, so I’m thinking the same about the Cosmos, which takes hands-on to find out. If it doesn’t work out, I won’t be as miffed as I would be at the Iridium’s price level.