Well....For one thing, the top attachments are not laterally adjustable like Ortliebs. If you have big dogs like me and have to slide the bags back a bit not having lateral adjustment could cause conflicts with rack tubing, possibly causing one to have to position them farther back than is necessary.
And call me a cynic if you will, but those reviews sound fake despite the verified purchaser claim, especially the first one. You have been using Ortliebs for several years, love them but you don't like the price? Why spend money on something new at all? Just keep using the product you love so much. In short, it sounds like a review calculated to sway the decision of someone who is considering Ortliebs.
Also note that, from the Q&A, the price is for one, not a pair.