I have the Bulldog and couldn't be happier with it. The old one motor system and our heavy toyhauler was awful, you basically had to chalk the legs to see if they were moving, and it sounded like it was about to fail. And then it did.
The Bulldog system was relatively easy to install, our main issue was with the generator on one side making access to the leg on that side a bit of a pain.
Be sure to check the distances between the leg stops on the trailer to make sure it will fit your trailer. They aren't cheap, but the alternative was to throw good money after bad.
Due to the weight of our trailer we had to set the motor to high torque rather than high speed, so it's still not fast, but at least you can see it move. And super, super quiet...it never sounds like it's struggling in the least. And that's with our 15,000 lb. toyhauler.
I recommend it highly as a replacement set of legs.