I've been using SEN pumps which I purchased from Kensfish.com for the last 3 years or so. The stand up to head presure better than most other brands I've used and their electrical consumption is no more than other efficient brands.
I own about a dozen of the pumps ranging from 300~700 gph. The only downside of this brand I can voice is that they do not come in larger sizes.
The two biggest pluses are how well they stand up to head pressure and how well they stand up to sand and other grime getting in the impellor assembly.