Mizzle,
As far as the SmartCarry is concerned, I bought it after reading a lot of positive reviews over on GlockTalk. As of right now, my Texas CHL is "Processing" so I'm not legal to carry yet, but I've been wearing the thing around the house to try and get used to it. First of all, the fellow that owns the company will talk to you personally to answer questions and resolve any issues you might have. From ordering online to having the holster on my doorstep was about 3 days. The customer experience nets an A++.
Regarding concealment, you will most likely not find a system that conceals as well as SmartCarry. I am 6'0 and 145 soaking wet, so it's rather difficult to find a spot on my frame where a pistol isn't really obvious, but nobody can tell when it's in my SC. From the wearer's perspective, looking straight down, it looks pretty good, too. Comfort is an A+. You'd think having a big hunk of steel/polymer riding on your man parts would not be such a comfortable thing, but sometimes I forget I'm wearing it. Using the restroom will take a little practice (with an unloaded weapon) but after a time or two you'll be all set.
I'm able to fully conceal a full framed P99 .40 along with the extra magazine. Tight jeans would be a problem, obviously. Drawing the weapon involves using two hands; your weak side thumb to pull your waistband out, and your strong side to physically retrieve the gun. I've experimented with wearing the rig a bit higher up, so that the butt is exposed enough to draw with one hand...results are good, but you won't be able to sit down comfortably when wearing it that way.
Drawing from a seated position requires straightening your body. Imagine how you look in your car when you have to dig our your wallet, and that's basically how it's done.
Some people are a little scared because it's basically just denim fabric covering the trigger guard. I followed the advice of a GlockTalker who said to unload the gun, double check, then wear it around the house for a day or a week, doing everything imaginable. At the end of that period of time, your trigger will not have moved. I did pushups, situps, ran, even physically tried to get the trigger to pull, but it never did.
I do not represent SmartCarry and, unfortunately, get no kick-backs for my recommendation. I think it is a rig that certainly has its place, particularly if you have a habit of wearing shorts (which I don't). You can wear a business suit with everything tucked in and nobody would know you were carrying.
Happy to answer more questions if you have 'em.
Blake