If you have always wanted to try something, then I think life is too short not to try it. Especially if you have the funds (Le Cellier is very very pricey, go google the menu!) It's not very elaborately themed, so it may not hold the attention of a 1yr old and a 5yr old...in the way that most nice steakhouses may not hold their attention. Order them the kids chocolate mouse dessert if they still have it...it's very cute.
But again...if you would kick yourself for not trying it...then go try it!
I didn't make an ADR for San Angel for the last 10+ years even though I've always wanted to dine above the boat ride. Because of reviews I read, or not wanting to worry picky eaters, or it not fitting in our plans etc. Finally this year I just decided even though I'll have a toddler with me, we are going there for a dinner this next trip!