I'm in the same boat as you when I start looking for baskets... Hayes is the only non-used option I could find. Aside from the cost, though, I'm not mad about that... the Hayes clutch has so much function built into it. Want to run it like a standard clutch? Take the lock up arms out. Want a slider? Take the base/"hat" springs out. What a hand slider? Run wimpy static springs and tune arms to suit. Because you can use generic springs and weights you can set it up to just about ANY range you want in any configuration. It has proven quality and proven function.... the only two down sides being cost and complexity. If you don't understand how to set-up a clutch it would probably be a nightmare for the average Joe to do on his own. All the stories/reviews I've ever read fall in line with those observations. You don't bolt it on and go fast... you spend some time and a couple clutch packs getting it right.
The EFM looks really cool, but I doubt it has that sort of adjustability. Some, sure.... but I don't think it was designed with being able to tune in really tight 60' times. I think if it did that with the sort of accuracy that you need/want, they'd advertise that it could do exactly that.... and drag racers would be using them a lot more.... especially because they claim to have been around since the 90's.
Attack life... it's going to kill you anyway.