I've got 2 sets of Altura panniers, I set of Ortliebs and I've just bought some Carradice Super C.
The Alturas have been excellent - much better in my view than the Ortliebs which I rarely use.
The RK fittings work well, although it can be difficult to tighten the screw on the lower clamp enough to stop it sliding. Both pairs have had some serious abuse over the years and the fixings have never given any trouble (unlike my Ortliebs), although the older set (not drylines) are now badly torn.
An example of the absuse I've dished out to my drylines:
http://www.crazyguyonabike.com/doc/Occupiedterritories If they can cope with that, they can cope with anything.
They also get used daily for my commute.
One link to your website is enough. G