You see a lot of Maxijet, Tunze, and Koralia too.
The undertow is actually more of an 'issue' than the direct flow for me. I have some fuzzy mushroom and GSP on the bottom of the tank that are in constant motion, but it's a pulsing motion which isn't a bad thing.
I am sure that if I put it on full speed and stuck a frogspawn a foot away it would beat it to death but in full speed short pulse mode it doesn't do the "wall of water" thing in my tank. I have a nice 1/2 - 3/4 inch wave which rocks everything gently. I have some frags on small rocks no more than 12 inches from the pump and they stay put, but they would probably shift if I just cranked it up and let it blow on them.
Vortech obviously isn't for everyone but having had several different pumps... I see very few down sides to the Vortech.