I think it is wonderful! My kids all had recorder and it didn't stick. We've always had ukes in my family and now, my 5.6 year old grandson has one and loves it, esp. because it seems like a kid-sized guitar to him. He can do a couple of chords, but I think I'll add some tape/markers for him to make it easier. I didn't used to believe in using them because of ear training but I think at his age he'd get more enjoyment out of it and he has a good ear already.

If you search youtube, you'll find plenty of young'uns who could grow up to be another Jake Shimabukuro.