I've performed many shops for ACE. I received a large check and a letter saying another partner and husband had taken over the company. As I recall it was professionally written. They had cell phone shops and observations in one city now it's menu audits. In another however it's one dining area and lots and lots and lots, did I say lots of oil changes with a shop fee. The fee goes up through the month as well. I've done oil changes for complete strangers.
They had problems with payments....they used PayQuicker which was good but then charged then switched to something that started with a D..never received payments from them.. Then I received a check. So it seems that they resolved the payment issue. So now I've done the oil change shops and will continue to do so.
Do not read so much, look about you and think of what you see there.
Richard Feynman-- letter to Ashok Arora, 4 January 1967, published in Perfectly Reasonable Deviations from the Beaten Track (2005) p. 230