I found Tennille and Jose to be quite nice. During the annual county inspection, Jose demonstrated that he clearly knew his way around a septic system. I received a copy of the final inspection report submitted to the county without having to ask for it (I was copied on the email submitting the report to the county).
An area for improvement involves scheduling. They did not show up at the appointment time. When I called an houjr later they realized they hadn't put the appointment on their daily schedule. They were very apologetic and came out after regular business hours that same day. My sense is that missing an appointment is unusual for them.
I do plan on using them next year.