I've really been giving appendix carry a go recently. During the week I carry a Kahr CW9 in a 3Speed belly band holster. I went with a belly band because I work in a "business" environment that requires me to wear dress pants and tucked in shirts. I also live in FL so a jacket or cover garment isn't really possible, i'd stand out like a sore thumb. I also used a CompTac MTAC with the velcro clips, but I feel it printer more and requirement more attention to make sure it didn't show.
On casual days I am using a Remora no slip holster that is definitely more comfortable, although this could be because I can dress down a little too. Its nice to be able to adjust it on the fly since its not clipped in but this setup does not work with a tucked in shirt. Id like to find a good appendix holster for the Kahr that I could run all the time and not have to switch holster for the day of the week.
I also have tried running my M&P9c appendix but I don't really have a good holster for it yet. Its much bulkier so I find it much harder to conceal in business attire. I bought a Bravo Acer DG2 but I cannot find a comfortable place for it. Ive tried running it at dead 12 o'clock, 1130 (Im a lefty), and further back, but the holster has a sharp edge at the bottom that painfully digs into the crease in my leg/groin. Only way to avoid it is to run it higher up on my waist, but then I feel it shows a lot more.
I definitely don't think I am fat, but I do have a slight belly. Im 6'3 and 215lbs. Ive debated on selling the M&P to go to a G19 since there are so many great holsters out there for it. I've also been determined to lose a few pounds to see if appendix would work better with a larger gun.