I can't speak to Bumble & Bumble, but I just did this yesterday with the DevaCurl Academy. There were hair models with a whole range of curl patterns, from 2a to about 4a. What I saw was that even though the instructor and senior stylists were walking around and observing, they were definitely paying close attention and spent time with the students as needed. I felt completely at ease during the whole process.

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Modified CG since 11/5/11
CLEANSE: VO5 Vanilla Mint Tea Clarifying, DevaCare No-Poo, CHS Treatment Shampoo
RO: DevaCare One Condition, SS Caitlin's Conditioner, Mop Top Daily Conditioner
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier and Strong Hold Mousse, Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel