I've had the yamaha panniers since I bought the bike new in 2008. To be honest they've done the job, still on original locks and no major issues (just one lost hinge pin), they're just a bit on the small side. I can't justify replacing them really until they are unserviceable, but if I did I'd probably buy ARD cases and a Holan rack from here...
http://ardcases.co.uk/store/#ecwid:c...roduct=6143541
I use a second hand Trax top case (which I acquired from a mate for free) and to be honest it's crap - it leaks (but silicone fixed it), the lock broke and the catch has gone rusty and the mounting plate's aluminium has worn so much it doesn't lock home properly and rattles! (I've no taken the plate off and its bolted to my TT large rack) I definitely wouldn't part with money for one of these.