Remember Sarah, they are LONG, they are heavy, and they don't have a belt clip. So be sure you're prepared to hold it for your son when he gets tired of carrying it. DS lost his (set it down, then it was GONE, so it was lost then stolen, basically) b/c it was so big and heavy for him...he's used to the cheapie ones with the belt clips.
Of course your son is likely taller than my guy, since you are taller than me! So your mileage may vary; I just want to make sure you know the pitfalls of the BYO for littler kids.