Which sending unit?

Has anyone used the Right Stuff Detailing Sending Units from Summit or heard any reviews on them? I am planning on getting an aftermarket fuel gauge and a new sending unit with the 3/8" line since the rest of the system is plumbed 3/8". I have seen the one on Mancini's sight for a $112. So after seeing the price difference I figure I better ask the experienced FABO team.