I had a really hard time making up my mind between the Keepers and a JM Custom Kydex for this feature and, to a lesser degree, the extra velcro on the belt loop. I ended up going with the JM Custom Kydex with the thought that I could always cover it in glue and velcro myself if the need arose :-)
Due to the particulars of my physiology AIWB has been the only method of concealed carry I've been able to get comfortable with. I have been carrying in an RCS Vanguard 2 for a while now, mainly because it just worked. Even so, my intention from the start was to replace it with a "proper" holster so I could practice more efficiently using my actual carry gear. Plus, these words kept echoing in my head ;-)
I had less than satisfactory results working my way through the more popular AIWB offerings and my last attempt - the venerable CCC Shaggy - left me even more discouraged as it printed badly for me and the ride height was just way too low. I'd almost resigned myself to just stick with the VG2... but I'm glad I didn't because the JM Custom Kydex AIWB is, in a word, awesome.
I ordered mine with a medium guard, soft loops and the extra tuck option and have found no need for wedges or the extra velcro. Some have said the soft loops printed badly for them... perhaps the loops have changed, as mine lie flat against my belt just like the RCS ones did. The holster rides at the perfect height (which, according to the website is "low") as it allows me to get a good grip without my knuckles scraping against my wilderness belt. Comfort is as good or better than the VG2 while offering more stability and consistent placement. Concealment is excellent - I carry a G20 and can conceal adequately with the right t-shirt now - with normal dress (jeans with a tucked t-shirt and untucked button-up shirt) it conceals better than the VG2 despite the size differences due to the extra tuck option and the grip being tucked in more.
In short, I could not be happier!