I use a Smart Carry daily, but not for a 1911. I actually have a couple, one for my Seecamp, the other for my P230/P239. I mostly use the Seecamp.
The Smart Carry does work as advertised, and I dont doubt you could carry your 1911, given the desire to do so, and the right choice of pants, but I find the smaller guns are much easier to deal with if your active and carrying on a daily basis. I work in construction and I'm in and out of equipment and trenches all day long, and it works great. Of all my holsters, it also keeps the gun the cleanest and basically allows no junk or dirt to get in, even when you work in a dusty, dirty environment.
I wear Carhartt type pants most of the time, which are more fitted across the front and dont have a lot of give. A 1911 would never work for me, and even my P230, while somewhat doable, its not real comfortable. The PP230/P239 are much more comfortable under a loose pair of pleated Dockers or a pair of sweatpants. The one issue I have come across with them is, you need to put an iron on patch on the inside of your pants where the gun comes in contact with them. You will get a wear point or points, depending on the gun and holes will eventually wear through if you dont.
I've never had a problem accessing the gun, even while seated, but it is considerably slower than a good IWB holster.
I also carry a SIG P229 in an IWB holster. I carried a Commander for years the same way. I think you'll be a lot more comfortable if you go that route. Its really the most comfortable and concealable way to carry a full size pistol on a regular basis.