So what's the difference in pro? I don't know because I never really played with the demo. You get lot's of telephone poles (Just kidding). I have half a dozen new lights on my toolbar. There are fill and dome sphere and cube lights. There's a distant light that acts like a sun and influences clouds in the sky. Round and square parallel lights don't spread. I haven't figured out how to use lens flare yet.

There are a few dozen tweaks in the control bars. Don't think they are exclusive to 7 pro. You can crank the sun up to 999 now. You have X,V Zcontrol over HDRI instead of just rotate. There's a long and probably incomplete list on the DAZ website.

The regular 7 download is $16.47 and pro is $54.97. I'm pretty sure that DAZ will offer an upgrade from regular to pro eventually. It may be more than the difference in the introductory price now. Either way you can count on DAZ to release a free update for most of the bugs before the next full version.