Pros
Tons of different instruments to work on, from all different brands, and no owners/customers to deal with. You really get a chance to hone and perfect your skills in real time, with no real consequence to it. They will also pay you your hourly wage to learn other skills on the clock - like electronics repair or painting - if you really kiss up & pretend to be their buddy. Really great employee parking lot.
Cons
No room for advancement. Absolute cap on how much they’re willing to pay - you will NOT make $20/hr here. No respect for employees, Do not ask a direct question of management - they will NOT answer you directly.