Not if you aren't going to take advantage of the additional potential provided by the new heads. I don't think it's fair to disparage the TF heads which were replacing a very good head to begin with. Considering the IMM EQ head isn't available anymore, there aren't too many options available for something in that performance range ready to go out of the box. What's the next best iron head? The SM heads have potential but need to be loved on by someone that knows what they are doing. Good head porters aren't a dime a dozen. Around here I haven't found one that has a flow bench, everyone is just going by eye. So now you have another $100+ in shipping them around to make sure you get a good job.