I don't think I understand why people would pay for a tool like this: If I want to collect data from the users of my site, I'm going to write the survey ui myself: matching with the design of my site exactly and feeling seamless is crucial to being able to expect my users to take it.

If I were doing something non-professional, just surveying people I know, or what have you, I'd use a free Google Docs form. It looks far better and is easier to use than survey monkey, automatically is in a place I can deal with the results, and isn't trying to make money from me or my cohorts.