I would have given 5 stars initially, but when I had to return something for an exchange it was such a shame that I was allowed to only choose one item within that transaction!? It would be really beneficial if you made your exchange process accessible to how ever many items a customer might want to choose to buy. You might even make more profit in the end - so it would be good both ways!
It takes so long to wait for the credit to arrive when you could be given the option to use it straight away