I am interested in purchasing a shoulder holster for my Walther PPS-M2, but I am not that well versed on what and who makes a quality but comfortable shoulder holster. So many configurations available. This would NOT replace my every day carry holsters, but would add to my options when a shoulder holster would fit the bill. Any suggestions on what to look for, which style works best, and is more comfortable to wear? Any suggestions would be appreciated.