What feature do you want to try out? If it's the texturing and checking how it'll look on the model, you can do that with the demo, just not as easily. You can make your texture change, save it, then load the texture in UVMPro and see how it will be on the model. I think you can also do the fixing of the edges part with the demo. Yes, you can't save your work. It would have been better if the program allowed you a limited number of saves in order to be able to fully evaluate the features. But I can tell you that the program works great for me, and if you have any problems, I am sure that Steve will be there to help.