They also make some return type pumps and other things.
I like my wp's. Common complaint is need a monthly good clean and scrubbing or else they slow way down. Definately make sure you get warranty, though even if one dies, can buy 3 for the cost of the name brand.
FWIW out of a 40 (original not newer) and 2 wp25's. One wp25 died on me at around the 6-8 month mark. The wp40 I may suck at cleaning but seems like it's running a bit weaker, but again I may not be cleaning it's channel well enough.
For the money and options they give, I think they are a great bump up over buying a simple koralia. If you are well off enough, stepping up to the big boy club ones isn't bad either. I hear the wp described as more a channel of water vs a nicer broad wall from MP's.