It does not say what the cells average voltage is, so I would say in general they are probably not a good racing pack. Good for bashing I bet, but their slogan is "Perfect Solution for RC Toy."
I bought some of their unmatched 3000's and they are okay batteries, they last awhile but they do not have decent voltage. Their average voltage @ 20A is 0.96v. My packs draw down immediately to 5.9v once a load is applied, stay there for maybe 20-30 seconds and then drop to 5.6v and hold that for another 350 seconds or so. Not good overall. But that is their "unmatched" pack.
Being they don't tell you the numbers, I'd avoid them for racing.