Pros
Few consequences for failure. Almost impossible to get fired. Most customers dependant upon OEM for service so there is good customer loyalty regardless of the level of service provided. Take home pay good when overtime is considered.
Cons
Poor organization. Last minute schedule changes due to poor scheduling. Poor work/life balance. Having to deal with enraged customers angered by poor handling. A customer call-center structure that is getting worse by the day resulting in customers not being able to schedule service or get support. Excessive delays in getting pay issues resolved. Long delays in getting expenses reimbursed. Requires the use of one's personal vehicle to perform service calls. The reimbursement for this is not enough to compensate for fuel and wear and tear. You pretty much have to buy them a car for the privilege of working for them. Difficulties in getting used batteries and other used electronic gear disposed of properly. Used batteries have been known to have been left at customer sites for months.