While I'm sure they would enjoy it, personally, I would wait until they're a little older...maybe 12 and 9. Tickets for the show are expensive (in my opinion), and waiting those couple extra years would ensure that it's something your kids could truly appreciate.
That being said, I'm sure there will be many posting saying that your kids would enjoy it...and, to be completely honest, I couldn't fight that reasoning either.
To me, however, I would wait a few more years.
If you decide to go this year, enjoy it! It really is wonderful.
RyMickey