I've been using AquaSurge pumps for a couple of years now, mainly because that's what my supplier pushes. Haven't had any problems with them.
Then again, last year I had a pump choke on me and when I was at Princess Auto, saw a pond pump (4000gph) for cheap. All stainless steel. Good warranty from the place. What the hell, bought it, I'll run it.....if I get 5 years out of it, it'll owe me nothing.
Anything mechanical or electrical is a crap shoot in the end, I figure. Some are more reputable than others.....blah, blah, blah......industrial stuff is tougher and lasts longer, but it costs a lot more...anything that has the word "pond" attached to it costs more than something that's not for that specific application.
I figure, hey.....it's a pump, not a truck. If it chokes in a year, I'll get a new one under warranty.
Now, if you ran a sump pump continuously for an application that it's not designed for, it's not like the distributor knows that it was running a pond.
Hum "Amazing Grace" when you return it and your conscience will be clear. The margin on that stuff......sheesh.