I have a mean/scared little dog with a short coat, and a big dopey Aussie mix with a longer coat. I brought them in at different times on the same day.
The Aussie's backside was all matted and out of control, and the gentleman who was there on the Sunday I came in told me that he'd probably have to be shaved back there. That was fine by me. They brought him behind the gate and he was happy to socialize with the other dogs that were already there.
When I brought my little House Monster in, I warned the groomers that she's unpredictable and could be mean to smaller animals. The female groomer introduced herself to my scaredy dog, and spent several minutes warming her up before I left her there. At my advisement, they kept House Monster separate from the other dogs so she wouldn't do anything naughty. At the time I dropped her off, I found out that they had taken the time to completely brush the mats out of my Aussie's butt and he looked fantastic.
When I came and collected the pair a couple of hours later, they were both clean with neatly trimmed nails, they smelled amazing, and they seemed to have been treated quite well. I'm definitely going back.