How are those coils working out? I know when they first came out there were some problems with leaking according to the guys at the supply house. Right where the copper and aluminum were connected. I think aluminum is the only way to go anymore. That or quit using chinese copper.
I have not noticed any difference in the performance of these coils. I have been installing them since they first came out with them and have had no issues with them. Not saying there won't be. But as right now, there are none.