I have a Flea and a Flight TUS-35 which also has a plastic body and a laminate top. I enjoy them both and honestly, they are very VERY similar in sound and feel. The most obvious differences are aesthetic. Another consideration; the Flea's neck is a bit bulky and an unusual shape; I initially found it uncomfortable. Also, Flight ukuleles have geared tuners which are much easier to use than the Flea's friction tuners making the Flight more kid-friendly.
Would I let the kids play my Flea? Nope, it's probably just as kid-resistant as the Flight but considering the Flea's price tag, I wouldn't risk it. I played a Flight Ultra Travel Soprano at a uke festival last weekend and I liked it. It was very nicely put-togther and appeared industructable so that would be my choice if I didn't already have a TUS-35.
One thing to remember: a plastic (or mostly plastic) ukulele will never sound like a wood uke, which isn't necessarily bad, they're just different. Try before you buy, if you can. I like the Flights, Fleas and Flukes discussed in this thread but some other plastic ukes sound horrible, don't stay in tune and are uncomfortable to play. A kid could easily get turned off to playing music if they've only tried an inferior instrument.