Olark is a great tool. We (UserVoice) often use it when we're launching a new feature or change to our sign up onramp. That said you can quickly find it overwh

Olark is a great tool. We (UserVoice) often use it when we're launching a new feature or change to our sign up onramp. That said you can quickly find it overwhelming (and distracting). It's great feedback but you really need to dedicate someone to doing it. UserVoice comes in for all those times when you're not able to be online and dedicated to just talking to customers. We use UserVoice to deal with any support issues that coming in (via our Helpdesk product) and to sequester any good ideas and build up support for new features before we build/launch them (via our Feedback product). If you're really early stage then definitely use Olark but if you're getting any sort of traction at all you'll want to have UserVoice to cover the rest.