Need a new laser-Spectra G422?

I am in the market for a dual slope laser after the CST/Berger I bought last summer turned out to be a steaming pile of garbage. So far the recommendation I have gotten is for the Spectra G422N. Is it a good laser? Is there something better? My main use would be for building retaining walls and patios with occasional grade work and the odd pipe job here and there.

Also, I read here that the CR600 receiver is the way to go. Why is that? I really don't know much about lasers so I'm...

Need a new laser-Spectra G422?

Need a new laser-Spectra G422?