I've used Topeak racks exclusively for more than a decade. They haven't given me any issues on the range of bikes, from a converted MTB to design-specific touring bikes.

I did have a Blackburn front rack with the hoop over the wheel, but I dispensed with front panniers quite a while ago.

Topeak racks, for me, have been durable and stable. The newest ones with the "drop bar" that lowers the panniers below the top deck have worked well on the Thorn Club Tour bikes we're now using.