I guess I won't be doing any condenser only change outs on heat pumps. But I've never had that happen on a cooling only system. Usually I don't even need to adjust the charge. Of course I have no way to verify how many BTU's the system produces, but the owners say it cools better and the bill goes down. But I will definitely try to pursuade them into a new system.
Recently a building with (4) 10 SEER systems had all of the condensing units stolen. A contractor came out and replaced all of the units with Goodman 13 SEER units but did not even try to sell them new coils. I thought the building felt really humid when I was there but I was just visiting, not working so I didn't get involved.
