Ease of Use:
GReat, unlike the previous reviewer (who is ignorant about how to use it) it works great, you have to block your trem system so it is a down only system, this is the only way it can be done, it is impossible to drop a string on a floating bridge without affecting the others.

Overall:
This is a great thing to use if you need to drop D fast. That way you wont keep your audience waiting

Sound:
the first person who reviewed this is obviously dense drop D is when ONLY the low E string is lowered to D EADGBe => DADGBe (that way the root-5-octive or powerchord is a barr chord on the 4,5,6 strings) i find it hard to beleive that he plays "metal" and doesnt know what drop D is so yah on that note its a great product

Feature:
If you have your bridge blocked and set up right, it works as advertised.

Quality:
It's very solid. The chrome on mine got scratched on the face where it rubs on the trem but you can smooth it with some fine sandpaper.

Value:
This is exactly what I would expect it to cost. Other companies make drop tuners that are similarly priced, though not for a Floyd (that I know of).

Ease of Use:
It's very convenient on stage, but tuning is more annoying beforehand. I found that you can't really use the fine tuner on the low E anymore, so you need to keep your allen wrenches handy and use the tuning key on the headstock. I would also adjust it every couple weeks and make sure it's working right because the adjustment seemed to vary with the age of my strings. Finally, it did make using the trem a little bit stiffer because of the blocked bridge.

Overall:
If you need it you need it. That's it. If you don't need it, I wouldn't get it 'just for fun'.

Sound:
first of all, the first person is an idiot..it is meant to put your guitar in drop D on the E string thats it! it works great, saves a lot of time

Overall:
I first want to to start this review by saying i did not actually purchase a D tuna, it came equipped with my wolfgang. This is a fine way to drop your low e to d tuning in less than 5 secs. Which is perfect for any VH cover songs. It was designed with that in mind. Which would explain why it does not change the tuning of other strings. In the end the D tuna performs nicely and adds an easier way to achieve more sonic capabilties on your guitar.

Sound:
It does nothing more than drops the low E string into D. It does not set up the other five strings. You still have to tune the rest of the strings as normal. Your tuner, a piano, or a plain old five dollar tuning fork can do the same thing. My point is this; If it dropped the tuning of all six strings with a single click it would be awesome. Since it only does low E and you have to tune the rest of the strings as normal, you can save yourself some money by using a tuner (if you have one), or a plain old tuning fork.