We have a number of quotation apps, some with address verification functionality and some without (and I'm in the process of scoping out the changes to add it to all apps).
The dropout rates for the apps that do not feature address verification are higher than those that require the user to manually input their full address details. I don't have any data or stats to provide, although I'll try and generate some to illustrate the point.
The only instances I can think of where address verification is cause for increased dropout rates is where it is poorly implemented in the form design, where it may confuse the user - for example, sites where the validation either spawns another window (i.e. not in-page), or the validation pre-fills the form but leaves the cursor at the top...(these examples off the top of my head).
Apart from a poor implementation, all I have seen are positive outcomes from address validation because it saves the user time and effort (and in big web forms this is a massive benefit because completing web forms in general sucks!!).