I've built up quite a nice little toolchain customized for me in TextMate, not to mention that I rely on many other people's bundles too. There is a barrier for me to move away from the awesomeness that is TextMate, and it would mean that Coda would have to be amazingly better to prompt a switch.
That barrier would be much lower if I could import my bundles into Coda. You should enable it.