I thought I'd add a couple of other thoughts.......

I like doing my own heads, but obviously most people don't have the capabilities/equipment to do that.

So as nice as the TF heads are, if I were building something for myself where the TF heads would be a suitable option, I'd use the Indy EZ heads instead.
I can buy the EZ's for quite a bit less than the TF heads, and then do the prep and porting myself.