I am replacing my central air conditioner. One company has given me an estimate on a Goodman CSC14 14 SEER unit. The other companies I have talked to are very much against the Goodman air conditioner. They are implying that it is a builders model quality. Although Goodman may make builders models, I can't imagine that all of their models are builders quality. The other companies also say it is hard to get parts for Goodman. The other companies are all recommeding Trane XL14i. Is this really a better unit than the Goodman, or are they just recommeding it because that's what they have in stock?