First, if you're not noticing any problems, you'r probably ok. When a barrette pulls your hair, you know it!
I can't use anything with springs, my hair leaps into things that might tear it away. An alternative for you are spring-free barrettes, at tenderheaded.com.
Also, I don't know what they're called, but I switched from barrettes entirely to those one-piece things that click into place. Anybody know what I'm talking about? If you really want details on those, let me know and I'll post a pic.
1aFii Mink chocolate brown
Current shampoo: L'Oreal Vive volumizing
Current conditioner: Aussie Moist
Treatments: Queen Helene Cholestoral; Hask Henna and Placenta
Other: Aloe Vera gel, jojoba oil, meadowfoam oil, vinegar rinse, Suave styling gel
Silicones: Biosilk silk therapy, Alterna hemp spray
Typical styles: Multiple hair bands down the tail, braid/s, bun