It's sweet for both bass and leads (well duh, it's monophonic), but I really like it for it's bass. For solid, thick, powerful bass that cuts through the mix, I think it's one of the best there is.
However, I had a chance to get a SE-1x for $750 and I haven't looked back since. Every now and then the little voice inside my head tells me to sell the SE-1x and get the minimoog RME, but I'm not sure it would really be worth it. Thing is, the times I have heard a minimoog bass I think to myself that's a sound I want in my arsenal, but I feel the same when I hear the SE-1x. I haven't been able to compare a SE-1x and minimoog side-by-side yet, so I'm not exactly sure how much better (or if) the minimoog is . . . I think I'm just gonna have to buy a mini in order to put that question to rest (then sell the loser).
When I think of my most beloved bass makers (solid deep bass), the top 3 (in no particular order) are:
Minimoog
SE-1x
Omega8