I just wanted to add a positive note...
We had a rear-adjust SR for DD and DS. I found it really easy to tighten the straps. In fact, when I moved them to MAs, I was frustrated b/c with the single adjuster on the MA, I found it difficult to tighten the harness straps as well as I could with the SR.
Method for tightening the rear-adjust SR straps: obviously the straps can be tightened separately. Fasten the buckles and chest clip, then push/pull the slack through to the back of the seat (before the metal). Once the slack in the straps is at the back of the seat, pull on the end of the harness strap to achieve adequate tightness, and repeat with the other strap. It really isn't a big deal since the straps are usually adjusted when the baby is out of the car. In fact, once you are not removing the seat from the car (ie. carrying it around anymore), I found it quite easy to adjust the straps even with the seat installed in the car.
Just my personal experience, but I didn't find the rear-adjust SR to be so bad...:twocents: