ddonkey, I don't pretend to be an expert but will offer my opinion. I have two R9's, a Boberg shorty and a Boberg XR9L. The Bobergs are a pleasure to shoot, a unique engineering feat and, as with all highly engineered pistols, ammo sensitive. They are comfortable with +P ammo and are quite accurate. I have fun with mine at the range, but do not carry either one...reasons:
1. The shorty is not much smaller, tho somewhat thinner, than my Kimber Ultra CDPII in .45, which I carry when clothing/season permits, altho the R9 is my usual daily carry most of the year. Sights on the Boberg are much better, and accuracy is better at a longer range than the Rohrbaugh, and the recoil is much less vigorous, but my likely use for self-defense will be point and shoot in a CQB arena if ever that occurs and the R9 is simply the most comfortable carry 9mm for me IWB, OWB, or most often in my front pocket with a DeSantis Superfly holster with the flat pad velcro'd on when the pocket is large as in cargo pockets in shorts, or when worn in a back pocket.
2. The XR9L is a beautiful piece in Platinum edition, and really fun to shoot also, but I can get a higher caliber for the size...It would be a really good carry piece for some, but the size is such that I just don't carry it.
3. Although billed as a "pocket pistol" the shorty is not, IMO, a real pocket pistol...just marginally too large for my 5' 11" frame I guess.
4. The Bobergs throw a vigorous ejected shell casing which has a tendency to nail the shooter in the forehead depending on stance and grip...best wear glasses!
John