I've got one of those V237's that Dennis has used with the tabs on it. He is spot on with how they affect the wave.
I like the tabs a lot. I don't need an extra bag up front, I just change the angle on one of the tabs and my pocket extends back as if I weighted down the bow. Currently I have to sack my boat out as I haven't yet removed the ridiculously small hard tanks and plumbed in custom bags yet, so any time saved not having to fill another bag is super helpful.
So tabs can be helpful, if you're tired of filling/draining bags like me, but they won't make your wave potential any better.