My company is a Merchant on Paid On Results and I moonlight in my spare time as an Affiliate too so I get to see it from both sides. The thing I appreciate most about them is they have a good reporting and have a clear way of communicating to both Merchants and Affiliates. Their platform is easy to use, on both sides. Emailing them tends to get fast replies, but I would be better if they could reply at weekends rather than wait till Monday, plus would like to see a live chat being added rather than phoning for quick/simple things.