I had been considering a more minimalist sidemount system since DEMA two years ago and considering it even harder since a cave diving trip to Mexico last year. I have also been diving a Nomad and while it does everything ok and will carry a lot of weight ( steel 95s, stages and deco bottle) it is a little bulky for some of the SM diving we are migrating to.
This most recent trip to cave country I bought an SMS 50 as it was basically what I wanted - a minimalist razor style harness with a fairly streamlined 25 pound bladder. I used it on dive three of three dive days (shorter dives well suited to twin AL 72s) and found it to be very easy to set up and trim out in the water and it needed no more than about 20 minutes of futzing to set up and tune for my particular needs.
It worked great with AL 72s and AL 80s and there is adequate lift for a couple of AL stages in addition to the two primary tanks. It also worked fine with a single steel LP 95, although it needs a few pounds of trim weight to keep from rolling you tank side down in a hover. With 2 LP 95's and a 5mm wet suit, it would need about 4-5 pounds more lift to achieve neutral buoyancy, but it would be easily do-able with a drysuit.
I suspect there will be adequate lift to support a pair of X7-100s even in a 3mm wet suit, so it may replace my Nomad for anything other than LP 95 diving.
As a rental, it would have bags of excess strap and should fit anyone. More importantly, it also has places for the excess strap to be neatly stowed, so there's not much need to cut the straps for a smaller person. In my case, the only trimming I did was about 15" off the left hand side of the waist belt.