I almost considered an Eart after seeing some good reviews, but then I saw some bad reviews.The Eart guitars are absolutely worth it. They've jacked the prices up a bit in the last few years since they've become more popular, but they go on sale pretty regularly. NK guitars, if you find a used one, are killer as well.
My trouble with NK is that I can hardly find anything about them. The used ones seem to list for as much or more than new ones- I'm guessing new ones cost a lot to ship and import or something, maybe some risk in buying a new one? There is no trustworthy info out there on specs for them. For another 100-300 usd, I can get an Agile that has the specs listed and ships from only a couple dozen miles from me. Are NK's better than Agiles? Or even as good?