I LOVE this program. I don't do web development but frequently have to create backgrounds for powerpoint presentations, posters, or just desktop backgrounds. This program has saved me quite a bit of time. I love the features it offers and has proved quite stable for my use (it died once when I was saving a new template). I'm just really impressed with the quality of images it creates as well as the variety of formats it can produce as output.
Would definitely recommend you try out the demo as occasionally there are limitations to the templates. For instance, on a "text" template, I'd like to rotate the text to give it an angle, however the program can't do that. Not a huge deal as I can just export it, rotate, and crop in several other programs.