I'm definitely purchasing!

I've read the online version twice now and it's been an invaluable learning tool. I started with a very shaky understanding of functional programming and LYSE kept me engaged and learning the entire time. After reading and doing some experimenting, I have a solid enough foundation now to develop professional projects in Erlang. I think my only complaint would be the chapter on FSMs... a FSM is probably not the tool I would have used to solve the example problem ;)

Thanks again!