On the whole, I'm very happy. However, I've been a fluent vi-user for about 10 years, and as you presumably know, when something's a bit wrong, it's wrong, so:
If you use ^N or ^P to complete a word, repeat insertion goes horribly wrong:
If you have a text FooBar Foo
Press 'e' to get to the 'o' of the Foo.
Press a and then ^P to complete Foo to FooBar.
Now, in vi/vim, the inserted text...
2009-07-20 15:38:54 UTC in Vi Vim for netbeans