I have. Pinkies actually have the lowest fat content of all life stages (I have citation for this but am posting from my phone so will have to edit it in or something), contrary to popular belief. The ca
hos ratio is ideal, and dragons tend to enjoy them very much. I don't feed to any dragons under 16", but the larger dragons seem really to benefit from them. I feed pinkies sporadically depending on my supply, but it is certainly more often than once a month in most cases.
And yeah. I keep all kinds of herps so have mice on hand all the time. I absolutely agree with the poster above about contaminated sources. Petcosmart mice are overpriced and super low quality. Grab a small bag of pinkies the next time a reptile expo is in your area, much better price and quality. Online pinkies go for up to 25c each. Petcosmart wants 1.99 each, and they're nasty, I've had them explode on me before.
EDIT: mouse nutrition info source:
http://www.rodentpro.com/qpage_articles_03.asp