If your kids really want to go, why not give it a try? I have been to US a bunch of times and really liked it! I haven't been there in about 6 years, but we *MIGHT* be added it to our next trip. There is a special right now for $80 per person, 7 days admission to both parks. Sounds like a decent deal...not like we'd go for 7 days, but it's nice to have the option.
GIVE IT A TRY! You can always go back to WDW next trip. Or if you NEED some Pixie Dust while you're there, schedule one WDW park day or a DTD day.