I've been using DGG for a couple of months now and it's been great. As a programmer, it turns out that like 50% of what I search for at work is programming reference stuff, so I've found the !php and !jquery syntax totally awesome.

There's still occasionally searches that I make that I can't find what I need from DGG, so I manually go to google for those (and of course for image search). But DGG definitely meets my daily needs for a search engine, and I love how privacy friendly it it.