I also saw the sale and picked up a pair of Transfers his week. I got them mainly for front use since I have REI Keystones (which I like a lot) for the rear.
I'm using with Blackburn Custom low riders and the top clips seem a bit loose for the diameter tubing I have but the spacing adjustment between the clips is great. My only gripe is with the lower clip. The lowrider is single tube in the front and it is welded as double thickness in the back. The back is too thick for the clip to handle. There is enough adjustment with the clip to catch the front of the rack but I'm not sure how stable that will be on bumps. I wish there was a way to attach some type of bungee and hook to the bottom of the rack.
Otherwise I think they are a steal at $75 - and they match my rear bags!