If anybody answers that, how you want it answered,well i give up mate. Tis all down to your ears. Any given mat will (or maybe not for that matter ) have an effect on what comes out of your speakers via your TT *. Im sure some Rega lovers will say you really need the Rega mat, but again thats subjective. My advice,if you want to go down this route, is to try a few different mats if you can possibly do so.
* i.e. Tighten up the bass a tad or lift a slight veil off the mids a little or what have you. Or even have no effect, that you can (can't) hear, whatsoever. Basically you have to experiment im afraid,in my opinion of course.