I have 3 little 45s - G36, Defender, PM45. All considerably lighter than the XDS (and equal or better capacity). I like XDs very much, but my impression is that the only potential customers will be fan club members already. Doubt they'll be winning any Glock, Colt, Kahr, Taurus, AMT, Para, Kimber, Sig business.
Something closer in weight or size to the Kahr and they might....
Even Glock got it close to 20oz. G36 + 3PAT = XDS. PM45 + LCP + pepper spray = XDS