Good software BAD/Unfair upgrade policy:

There are many good HTML compilers out there and this program is one of them. However, I would not recommend it to other people because of the company’s upgrade policy. If you are a 2.xx licence owner like me, you need to upgrade it to a 3.xx license for $50 to get access to further bug fixes. I wouldn’t mind paying extra for features, IF I wanted them, but to be forced to upgrade for compatibility and functional bug fixes that cause recipients of the distributed e-books to complain is NOT fair.
The jump to version 3.xx was made from version 2.14, without significant feature upgrades. How long before the version jumps to 4.xx and one would have to pay for access to bug fixes? There is plenty of good competition out there. Shop around and make up your own mind.