"I have changed to FastSpring and couldn't be happier. Their system allows a fully customizable email to be sent to purchasers. Now I can send just the instructions needed to license Text2Go, which are now not much more than 'click this link and you're done.' Their order page customization is also very flexible, although I don't really make full use of this asI have my own shopping cart page and just jump directly to the FastSpring checkout page. The FastSpring administrators' interface is a joy to use. It has a gorgeous web 2.0 look and more importantly is very responsive. It's layout is all very logical and it has really useful context sensitive help on each page. I found this was more than adequate and didn't have to read through their user manual at all. FastSpring prides themselves on great support and that's definitely been my experience. Their staff are all very knowledgeable and they respond within a few hours, even on weekends."