My wife has the Front rack on her daily driver (Surly LHT). I got it for her because I couldn't find a better alternative for supporting her large Wald basket at the time. It is indeed very heavy (2# or so) but so, so stout, with multiple attachment points, and hardware for life. I would have felt comfortable riding my kids on the front, when they were little. It's that strong and well-braced.
Like Scott, I am curious about the Tubus Grand Ex. I would try it if my current setup were not so appropriate for my needs. I am a huge fan of Tubus. Maybe not the most elegant of racks, but strong! And no heavier than need be, with functional design. Good value for money.
John in Portland, OR