I am purchasing a new 5 ton TRANE AC and was recommended different air handlers by two different companies, but both are match ups to that model, but different technology. The TRANE 4TEE3F66A1000A is tried and true for 9 years. The newer one TAM7AOC60H5ISA has been out a year, but I heard that there has been a lot of complaints. Has anyone heard this or do you have a TAM7 air handler? One company trying to sell me the older model, said that there were so many issues that TRANE came out with a TAM8 model. And the TAM8 model is too new to be recommended because it also may have issues. Is there any truth to this or the stability of any of the air handlers mentioned? Thanks.