I found the Supersilvers to be closer to gut in feel, response, and tone than the 140H set (the only other Innovations I've had on my bass). The 140Hs were stiff, and while I thought they had an attack similar to gut, the decay had what I can only describe as an "aftersound" rather than the original tone just fading.
The Supersilvers seem to have a point where playing harder yields no more sound and I never find that with guts. That said,with summer and the outdoor gigs coming up, I'll probably put the Supersilvers back on my ply bass. I don't think they can be beat for the old school sound with tuning stability.