Allparts EVH D-Tuna Drop D Black

I bought this item in december 2014 and installed it on my Washburn Japan SEC's original Floyd Rose. Installation has been performed by an authorized luthier, the one that takes care of my guitars for many years.
I also had to ostall AllPArts Tremol No to make it work, as specified in instructions.

Pros
-easy to install
-simple to use
- well built
Cons
- no matter what you do, you will never be in perfect tune in both tunings (standard and D-dropped) because of the tension variations induced in the tuning system

If you play regularly in standard tuning and want ONLY to go D-dropped for a few chords, or just on stage - this item is a very good choice.
If you expect it to be in perfect tune and record in studio with it, you should definitely re-tune the guitar, especially if you play with keyboards/synthesizers.

Please note I wrote this review after trying, together with my luthier and a lot of internet research, all possibilities of installation and fine-tuning.

I hope this helps.