Captain Allstar performed at our house for my son's 4th birthday party. It was awesome from start to end. First, scheduling was easy - a call to Captain Allstar himself and we were all set. He also mentioned that we should stop by his show at the Vienna Summer Concert on the Green (we did and it was a great time - Captain AS introduced himself and had our son on stage during the show). A few days before the show, Captain AS called to make sure of the time and to assure us he was coming (it can be stressful when your schedule the entertainment for your kid's party's this ahead of time and you haven't spoken in a while - we had no such stresses).
As for the show - Captain AS car early to set up, and just hung out on the back deck while the kids all arrived and played. When the show started (mostly 4 year olds and some 7 yr olds with my daughter), he was a huge hit. My son did not stop laughing and pointing out the silly things that Captain AS did in his act). He is more goofy magic/comedy vs straight magic, which is what we expected and wanted. He had groups of kids on "stage", made my son the co-star of the show and made everyone laugh and have a great time. I should note that it was 92-93 degrees and really humid - and the show was in our backyard. He was an absolute professional.
I really can't say enough about Captain AS - if you want a great show for young kids with no stress, he is your guy.