If you are looking for firsthand feedback on Evolution/Advantage pumps, I would try doing a google search for "koiphen evolution pump" & "koiphen Fluid Dynamics pump." You'll see lots of relevant search results for the Evolution pumps, but not as many for Fluid Dynamics since they haven't been around as long.
It's kinda sad that this site has so many monsterfishkeepers, but so few monsterfishtanks, where these types of pumps would be used. I didn't get too much help on here either when I was researching pumps for my tank...I had to jump to pond forums to get first hand experience/advice.
I agree about the first hand experience. I think there are more pond keepers than monsterfishtanks.
The basics are the same though. One needs to compare the pump performance curve of the different pumps to determine the best fit for the application. Wattage quoted may be the max or the average, so be careful. Wattage varies depending on the load put on the pump. Some manufacturers will provide the wattage performance curve upon request.
Pumps also come in different ratings. Low, Medium and High pressure. Obviously, for high head pressure like for a pressurized filter system you would go with a high pressure pump. Generally, the higher the pressure the higher the rpm. This is where variable speed pump come in handy for people who wants to dial it in. Seals are always the weak point as far as reliability mainly due to the sensitivity in installation tolerance. Unless it is a cheap pump, most pumps are equipped with a Buna or ceramic seal which are applicable for saltwater. I've seen in the past three years that manufacturers are offering many different motor options in order to lower prices for the consumer and increase profit. A original Baldor motor pump may now be available with a Marathon, Emerson or Century motor.
I believe the one thing to watch out for is operating temperature. Being installed outdoor vs in an enclosed cabinet make a big difference.