I remember the 510 Deore. Had a Giant Wasp with it.

If you're referring to the M390 Acera, I think you'd be hard pressed to notice any difference at all, especially in shifting performance.

The new Acera crank is Octalink (V2), whereas the old 510 Deore is square taper. If you splurge for the Alivio crank, that is now Hollowtech II.