I own two of these racks, with one on my Surly Disc Trucker road/touring/commuting bike, and the other on my Salsa Fargo bikepacking rig.
The build quality is superb, and at 21 ounces they are surprisingly light for a rack rated to carry 88 pounds, which is far more than I ever hope to have to carry. I like the lower side rails that let you mount panniers for a lower center of gravity and better stability. Tire clearance is excellent, even on my Fargo, which has a 2.3 inch rear tire and wide fender. I prefer tubular steel for its superior fatigue strength and durability as compared to aluminum alloys, which can be important on bikepacking trips in rough terrain when you can be several days from civilization.
It seems this is a very in-demand rear rack, as it should be. I waited for WBW to get them in for several months, as they had the best price I could find online. They came with all necessary parts for installation and look really good on my bike. I have large feet (size 13) and my feet don't strike my panniers due to the offset rack to hold my panniers. This is certainly one of the more expensive racks, but for something that is carrying my work clothes, phone, laptop, shoes, I do not mind the higher expense for greater peace of mind. I will definitely buy again for my n1 bike.
I replaced my Surly rack with the Logo Evo and, so far, am happy with the decision. Also made of steel, I expect the rack to hold up to a long tour. The lowered side bars for panniers are great... this allows for my Ortlieb Back Rollers to go on the side without blocking access to the top flat part of the rack. In my case I am using an Ortlieb Rack Pack across the back... works great. The rack is much narrower than the Surly (where there's clearly some of the weight savings), but it makes no difference using the Rack Pack (might be worth considering for someone planning to bungee a bunch of stuff to the rack).
The main complaint I have is the hardware... all of the bolts are Torx instead of Hex, requiring that I bring a Torx wrench on my tour. Likely, I'll end up re-installing using Hex hardware so I can stick with just allen wrenches. Also, installing the stabilizing bars was very tricky on my Disk Trucker... actually had to use pliers to turn the Torx screws because the angles were impossible to fit a wrench.
I have a new specialized AWOL touring bike that was set up with an inexpensive rear rack. When the Ortlibe panniers were on, the bike would have front end shimmy over 15 miles per hour that was very annoying. This rack was noticeably stiffer and eliminated the shimming. Even though the price was also stiff, I am very pleased with the way this rack lowers the center of gravity and makes the bike handle better.
It looks really nice, very intuitive design, and sturdy. What initially drew me to the rack was the warranty. They'll replace it if it breaks no matter where you are. I also really liked I could attach the bags in a high or low position.