Never did anything.
I can't judge the quality of service because they never got around to doing anything. I called the company on Tuesday and scheduled service for the next Monday. I talked to Ricky, who said someone would be calling me to schedule a time. Friday evening comes around (for Monday service), I heard from no one, so I called back. The person who answered said someone would be calling me right away to schedule a time. I finally heard from their tech on 9pm Sunday evening to schedule a time for Monday morning.
They arrived with two men and a hand shovel, and quickly determined they couldn't break the surface soil, so I'd have to pay an additional $300 (on top of the regular service) for them to bring in a small excavator (scam). Naively, I said OK, and rescheduled for another day off work. I got a phone call on the day of the service; their excavator broke down so I have to take a third day off work for a 1 hour tank service.
I called another company. One call and I had a scheduled time, they showed up with an excavator, no extra charge, and got the job done in 1 hour.