We began to look at them, unfortunately while the API was straight forward the documentation was simply wrong in many places and contradictory which was a tad frustrating. The biggest issue for us was they simply couldn't answer even the most basic question like their current PCI-DSS status, information about their network or datacentre setup (or even where it was hosted) in effect we couldn't complete any PCI-DSS assessment docs. Needless to say, we simply did not feel confident handing over our companies account and other details they were asking to go live with. Let alone let them handle our payments. This was a few months ago, and they were having teething issues which may have now been resolved I suspect given how common such questions should be they now have the answers in place we may well relook at them in a couple of years time if they are still in the marketplace.