Bring on the R41 comparisons. I want an R41 but sure don't need it. Maybe this is a good sub?
IMO, an open comb and an R41 are different animals. Both aggressive yes, but the R41 is more so than the average OC. Personally I think if you haven't tried anything on the aggressive side before, don't go to the R41 first! So I guess the answer to your question would be, it's not a substitute but a good next step before an R41.