Just looking it up, the Vertex IN250 is $320. The EuroReef RS250 is $490. They are the same height and diameter.
Hell, for the $170 difference, you could slap on whatever pump you want and still take advantage of all the additional features of the Vertex...
I'm seriously going to have to take a long gander at these things for my own setup.
Well the height and diameter being the same is correct however throwing "whatever" pump on these would be a choice as they have been developed with their own impellor to work best with the bubble plates and efficiency.
Throwing another pump on these may or may not produce the same results as initially determined by the manufacturer.