I made the mistake of buying a monstrous Yellowtec boom ($300, and it doesn't even come with the clamp for the desktop...you have to buy that extra). The springs in it are strong enough that it only wants to stay extended. To keep it in one place, you have to tighten the knobs extremely tight. Then if you want to fold it, you have to lean way over to loosen each knob.
It comes with an integrated mic cable that has no plugs. You have to install them yourself at both ends.