Not the best unit out there. I have one sitting on my desk right now that was going to be used for a different project, but threw it on my 858 for a shoot back in november, and it was wobbly as hell, even after everything was torqued. I didn't bother with loc-tite because it was coming back off. It's also a pain in the ass to remove the dust cover for cleaning when in the high position.
On that note, you're better off getting the fixed NEA models, they're better built IMHO, and still in production. I don't think Rauch is in business anymore