we've been allowing people to upgrade for free since this company was founded. I would say the current version works very well, especially when compared to 1.48.66. I would definitely recommend downloading and trying out the demo version, and test it in your most common situations, to ensure that it fits your needs. That's why we allow you to demo for 30 days.
There have been a couple system configurations that have given us some trouble, but the majority of those have been addressed in this update. Even more will be fixed in the next release.