Erm, aside from the fact that they seem to be in pretty good financial footing these days - given how easy it is to export your data from Evernote, I don't see why you would be hesitating. Just export and save once in a while.

My only beef with Evernote really is the relatively ugly web UI.

[Disclosures: I have no relationship with Evernote aside from the two premium subscriptions I pay for]