It went great. My 9 year old got one of the sickest card pools for a sealed tournament that I've ever seen. It included thing in the ice, jace, westvale abbey, invocation of saint traft, liliana's indignation (absolute allstar in sealed) and her support cards were pretty solid, too. I basically had 50 mins to build 3 decks so I built mine and while doing that told the kids to figure out what colors they wanted to play by whatever criteria they wanted to use. Then I went and built their decks based on their color choices.
My 9 year old's card pool in the hands of even a semi-experienced player would have been a 4-0. But she went 0-4 (0-2 each round). I watched a few games out of the corner of my eye (arranged it so they sat on either side of me all day) and there were a few should definitely should have won but she just would miss plays constantly because well, she learned the game the night before. My 15 year old actually won a round. She was really psyched about that. Technically she went 1-2-1 on the day but her tie she conceded to her opponent since she was felt unlikely to get enough wins and the guy was a really good sport. Both girls' opponents all day long helped them with play, gave advice etc. A few even kind of played a few of their turns for them suggesting they take an action back and try a different action. None of them took advantage of their green opponents. It was a great experience and I offer huge props and thanks to all the players at Deal Me In Games.
@nedleeds I always run a few cards for the Shops match up in my oath deck even though the match up is usually fine, just because sometimes it isn't. And I have enough respect for the deck to not be stupid and ignore it.
Also I had this thought the other day: if people played more main-deck cards for the shops match up it would make more space in the sideboard, and they could play their Pyroblasts in the SB instead. Seems legit.