I guess now would be a good time to point to a great post by PaulWhiteNz about UDFs and SCHEMABINDING which I can not find right now. My read performance is quite good while write sucks as I am on my iPhone;)

Paul could you quote yourself please?

Here is the link to a discussion on SSC: http://www.sqlservercentral.com/Forums/Topic737008-360-1.aspx#bm738974