Thanks for the suggestion.
Looks expensive to me at £15 per month ad infinitum, plus 3.4% + 20p per transaction. More expensive than PayPal. Many of USPs don't really stack up, for me at least. They say - "No need to spend hours preparing envelopes" (takes me 10 mins every 3 months), "No need to go to the bank to deposit cheques" (I'd still need to go to deposit cash and i'd still get some cheques anyway), "No more multiple trips required costing fuel and time" (I just post an envelope with my Windows Cleaned slip, so am not sure why they highlight this as a benefit for those that distribute SAE's.
Roundtracker serves me well for the round organisation side of things.