We've been using the Flojet for years; one crapped out on us (pun intended) and we bought a second, but I fixed the first one so now we have two. It works very well and we power it with a wiring harness I made.
That said, I've never heard a bad word about the sewer solution and I would love to get my hands on one to try it out - it seems a lot simpler than the Flojet. One thing I would have to add is a garden hose fitting because that's what we pump into.
However, they go for around $160 bucks around here, and that's a bit rich for my blood when we have a working system already.
BTW I found out earlier today about the idea of using a Flojet to pump was water into a tote in the bed of the truck, and back out at the dump station. What a great idea!