i was very interested in the R51 a few months back, but it is the same size as my XDs. if i remember correctly, it was rumored to be smaller. i have also been bitten by the beta tester bug with the sig 938 and the XDs. the XDs both 45 and 9 calibers. my 45 XDs had some issues, but my 9 has been flawless. then the recall situation.
i would still like to finger fuck the R51, but i will wait for a year or 2 before i seriously consider it.