It works as advertised and I find it valuable when writing email and updates to clients, but it's input window is laggy and it consumes a huge amount of CPU (i7, 8G RAM) to the extent that it's near pinning the CPU when I'm typing an email sometimes. I've used the plugin on Chrome and never noticed it being resource hungry, so there's something odd here.

I've found it useful to turn it off in the input window via it's widget, type the message, and then turn it on and let it parse the entire message rather than live as I type. That seems to work well.