They're ok as long as their equipment works, i.e. their presets. They over filled my tank by 25 gallons and expected me to pay for their mistake. Of course I didn't, since I didn't order the amount they gave me. Had they called me back I would have invited them to siphon the difference, but they didn't. It pained me to be referred to as someone who "wants things without paying for them" by their receptionist, when in fact I have an exemplary record with payment, always there to pay, in full, and never a bounced check. Sadly my association ended with their arrogance.