When I started my trip, I only had back roller plus Ortlieb panniers. Deuter rack pack uni's on the front. Throughout my trip I continually replaced my front panniers, firstly with a cheap throwover pair, then AGU front panniers, and then Vaude roller panniers. None I liked as much as the Ortliebs.
Now that I work in a bike shop, I picked up a pair of Rear Bike Packer Plus to use on the front. They are MUCH better than anything else I have had. The Vaude's came close, but the rear attachment hook snapped off.