Associated Reedy Wolfpack HV-liPo 7.6V 4200mAh 50C Shrt

Im thinking of buying this its right around the $50 price range new - and from what im told 30c would even be fine in the setup.
in any case as I understand after talking with people about this and reading is that the C rating on this has to do with discharge rates?

in any case is there some reason why this battery would NOT be good for racing aspect? I would like to ask twice before buying once wrong fully. Thanks in advance as always!

I use one in my 13.5T 4wd buggy.. works fine. I just use a higher low voltage cut off setting with them like 3.4v or 3.5v per cell and I charge them to the normal 4.2v per cell not the High Voltage 4.35