I would give them a call back. I have had nothing but positive experiences with them. Probably a case of them getting backed up with all of the start ups/annual maintenance checks.
In terms of what they do, yes they check the pressures, new filter, clean the condenser, and things like that. For $100 it's well worth it in my opinion. Run an air conditioning compressor on low pressure for a while and you will kill it.
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