I have a couple of the Dakota ones from Rutlands too. As mentioned above, they look the very same as the ones from Axminster, although the Axminster prices are cheaper. It seems like quite a bit of the stuff listed as "Dakota" brand in the Rutlands catalogue are same as items listed as other brands by other retailers, in fact, from what I can see.
I find the Rutlands guide clamps very good. Rutlands, and possibly others, also sell a set of
wide jaws for them too, which I find can help set the clamp perpendicular to the reference edge (although a properly milled piece of wood would serve the very same purpose and would have the advantage that you could cut it to dimensions that suit you).
I also have a couple of others of different lengths, same idea but slightly different design -
these ones in fact. These ones have an additional router plate available for them to guide the router, I considered one of these plates at one stage but decided against it as I didn't think it was worth the expense for something that keeps the router a fixed distance from the clamp - if it allowed you to adjust the router out from the guide edge, after the guide was clamped (like the Festool and EZ Guide ideas) that would be more useful.