Well it seems okay, but I have a couple of suggestions,
Your commander has plenty of firepower and no support wargear, I mean personally I wouldn't have a twin linked weapon, just take the normal weapon and then take a shield generator, that way hed get a 4+ invun, or the multi-tracker making him fire both weapons in one turn. Something along them lines anyway.
Give your crisis suits a mixture of weapons, because at 500 points you need a bit of variety, and might I suggest a target lock on top of that, so one of your guys can shoot at a different unit to the other two. For example 2 of your guys are given burst cannons and missile pods blowing away troops, while the other guys is blowing a hole in an enemy tank with his fusion blaster.
And if you could I would personally, drop some points somewhere and take 2 10-man fire warrior squads rather than kroot, believe me they do suck.
It is quite tricky because tau in 500 points is hard to fit a decent army in, but I think with a bit of tweaking it could work okay.