I mostly use Duck Duck Go now (with liberal use of !g as needed), but the main issue I've had with making it part of my spoken vocabulary using it as a verb. It's much easier to say I "googled" something than "Duck Duck Go'd it" (duck duck went?) or "searched for it on Duck Duck Go". It's been a pet theory of mine for a while that any attempt at getting people to change the words they use is doomed to fail if the replacement contains more syllables (e.g. "letter carrier" for "mailman"), and now I'm wondering if that's something companies should take into account when naming themselves too.