Comparison Version 4 Power PDF Advanced Versus Version 5. If you decide to take my advice and purchase Kofax Power PDF Advanced, make sure you buy the new version, Version 5. It contains features useful and essential to lawyers too many to list. This page makes all the comparisons. Suffice it to say, it is worth paying full price of $179 to buy it from Kofax directly. I have been able to get along with Version 4 for several years; but, I am upgrading to Version 5. It has PDF/A compliance checking, which is essential of online filing of pleadings, the ability to do complex text and graphics redaction, and much more. I have only recently discovered some helpful features, such as scanning directly to Kofax PDF. This is the best $179 a practicing lawyer can spend, and they don't pay me to say that. Of course, I won't send back any checks, if they come my way. If you are a Microsoft Word user, or any of Microsoft's products which use the ribbon interface, you will be immediately at home.