I think I have both the TransIt from Performance and the Delta Poste Haste only one of the ones I have also has stays for trunks with fold out paniers. With the exception of the stays the two racks are basically identical. They are quality construction and as long as you don't over or under tighten them, they both work great.

I have mixed feelings about the Topeak. I've looked at them several times in the past, but always passed because I was afraid of being locked into the Topeak bags. I also prefer the four bolt attachment of the other two to the quick release of the Topeak.