I bought these for my LTD MH1000NT because the original ESP locking tuners dindn't hold the tuning very well. You can easily convert this 3/3 set into a 6L set or any combination you want. You simply unscrew the slotted screw, push the shaft through the housing and push it back in from the other side, now you can assemble ist the way it was and you're good to go! The reason for this was: if you buy a 6L set, the posts are staggered and you don't need that for angled headstocks.
So the installation was very easy, you have to drill a little hole into the back of the headstock (a drilling telmplate is included) and you can align it with the included guide edge.
The quality is awesome, these tuners are lightweigt and hold the tuning very well. Restringing the guitar takes less than 5 minutes now!