I've put about 10,000 touring miles on my Tubus Logp rear rack using full size and overstuffed Ortleib bags. It gets harsh treatment every tour, but the roughest was the Camino de Santiago across the mountains of Northern Spain. 11 days of constant banging didn't phase the rack. I read a complaint here about the mounting hardware (nuts and bolts) supplied with the rack. Keep in mind that every bike is different and it's not possible to supply hardware to fit every possible application. You may need to buy a few different length nuts and bolts, much like a fender installation. The rack itself is rock solid. The reviewer says he "tossed" the supplied hardware. That should tell you something about the reviewer. NEVER throw away unused hardware. Keep a jar of that stuff. It may come in handy at some future time.
I particularly like the low rider aspect of the Logo. The bags can be mounted lower which in turn lowers the center of gravity and also allows for more stuff (i.e. large tent bag) to be carried on the top of the rack. If I have any complaint it would be that the top of the rack is a bit narrow for everyday use when not touring, but overall, love it.
By the way, I did purchase my Logo rack from Bike Shop Hub a few years ago when they were in Flagstaff.