the sole resembles the original 500 series, unlike the XD retail series with the sharp edges...it'll have the TP crest on the toe as opposed to "titanium"...the serial number will be TXXXXX, possibly with a batch letter above it, or will have no serial number at all...sets up square to open, as opposed to the retails which mostly sit closed...feels and sounds more solid instead of the hollow sound of the retail...a lot more difficult to find since theyre not released for retail, also costing a lot more....tip diameter is .335 instead of the .350 on the retail...
i have two R580XD TP's and can say from experience that theyre a much better feeling and performing club than the retail...id expect no less of the 540's...
theyre worth the money, in my opinion