I recently got a guitar with a Floyd Rose tremolo unit and I am considering getting the EVH D-Tuna but I have two questions.

1)Does is work well?
2)How much pull back will I have on my floyd after installing it? (For dive-bombs because I know it reduces your pull back)

If your bridge is floating (which floyd roses are) The D tuna will cause you to go out of tune when used. By loosening only the top string the tension changes on the other 5 as well. I've personally never found the product to be useful for this reason.
^ yeah you have to set the bridge to dive-only to use teh d-tuna

if you want pull ups, don't get a d-tuna. simple as that, really
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I'll have to put the Classic T models on my to-try list. Shame the finish options there are Anachronism Gold, Nuclear Waste and Aged Clown, because in principle the plaintop is right up my alley.

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