Is this a good trade for me?

That trade definitely makes you a better team. You're not losing anything at QB, in fact you may actually be gaining. Romo is good but is a bit overhyped. Even if it's an even swap for QB, you're solidifying your WR corps. Harrison has been very disappointing and really doesn't deserve a WR3 position. I think most anyone would take Jennings-Moss-Evans. Do the deal!