Everything. ESS doesn't pay a livable wage the pay is terrible. ESS always have problems paying you on time then send out nasty emails to everyone asking you not to contact them about your paycheck. ESS doesn't take accountability for anything. ESS has a very high turnover rate. even among local management. The staff are rude, unprofessional, yell at you and talk to you any kind of way. ESS doesn't provide references so its like you never worked for the company no matter how hard you worked. Local staff is never available when you need them everyone is "out of the office". Its like they run from helping you cause its a scam company. The students, other teachers, and principals mistreat substitute teachers, and nobody holds them accountable it's an emotionally and mentally abusive work environment. Biggest regret of my career was working for ESS.