Well I'll continue to make an arse of myself further. Regarding experience, Jose, Barbosa and Kleiza have the best experience that you can get, which is playing for a national team.
And this isn't some summer camp, we are talking about tournaments which mentally can, in my eyes, be compared only to the NBA finals. Hell no, it's even more demanding. You will not get better experience than that, ever. Maybe it isn't required day to day in the NBA regular season, but in close games or hopefully play-offs it's handy.
Having said this it's a pity that some teams prohibit their players from taking part in international competition. So I think they miss a lot.
And believe me booing someone or writing mildly abusive comments isn't as bad as what might happen in some other countries. I do not condone that, just making a point.