Manufacturer reps are a genuinely useful part of running a med spa — a source of products, support, education, and market intelligence. They're also salespeople whose job is to influence your decisions, and getting real value from the relationship means staying in control of it. A rep can be an asset or a quiet influence steering your inventory and choices toward their quota; the difference is whether you're running the relationship or it's running you.
This is general education for owners, not professional advice.