We got my DS5 hair trimmed and colored (Buzz Lightyear Green) with pixie Dust on December 25. This is the busiest day of the year. We went straight there at opening and, as Safari Steve said, found out they didn't open until 9am. So we went and rode a few rides and came back at 10am. We had to wait about an hour and the line didn't seem that long, but there were about 5 people (kids, adults, male and female) sitting around inside. But that was ok - the stylists are great and fun.
Just FYI, the color washed out fine the next morning. I had to shampoo his hair twice, but it all came out easily (and turned the bath water a nice shade of green

)
The only bad thing about the color is that it takes a while to dry completely ,so we had green pretty much on my shirt where DS would lean up against me and on his collar, etc. I was worried that it would stain forever, but even after letting those clothes sit and not be washed for 4 days, it washed right out of a white sweatshirt with no pretreating the stain. So take heart!
Michel did my son's hair. He is really really good with kids and other CM's told me later that day, "oh I see you got your hair done!" When I told them Michel did it, they said "Michel has been working there forever! He is really good!!!!"
Go for it!
Angie