I've been using EN for a long while. Initially I just was saving personal notes that had no security implications. Various clips from the www, bookmarks, and such. Over time I began to use more for things like website logins to store names/passwords. For "public" kinds of sites-- forums, news, vendors, etc. I wasn't that concerned about security.
I'm now at a point where I actually do have some notes containing much more sensitive information such as CCard sites and banks. At that point I began encrypting all of that information but I have to admit I never took an in-depth look at how "secure" EN's security is. A number of users here seem to express considerable concern when it comes to EN's security, questioning how vulnerable one's notes might actually be. Obviously I'll need to take a closer look and make a determination as to whether any risk is worth the convenience.
Risk aside, it is very convenient having one's information available on multiple platforms. But...