I've been using SMC's for awhile. I really liked my 24c 5200 packs, they were very good packs, that I got around 100 cycles, 6 mos out of with no real noticeable difference in performance. I passed them down the road when I got my SMC 9000's. Me and my buddies got 8 packs that we have all abused in our E-revo's. This was around 6 mos ago. As new they performed much better then my Neu 7800 packs. By far the best batteries I've ever seen. If I was a racer and only concerned about initial performance these would be great.
Currently their capacity and punch have noticeably fallen off, the Neu's are slightly better, but have only about 20 cycles. The SMC's probably have around 50-75 abusive cycles, I normally run geared for low 50's on 4s. My buddy's ,who also got a set at the same time, but runs alot less frequently, performs about the same. There might be something to leaving them stored at partial charge, or not. But either way unless they have something that is proven better, they will not be my next pack.