I ask and provide them the form but don't always get it back.
I see Concepts05 apparently does this with the purchase offer in MA. In NY we are required to do it at "the first substantive contact". therefore I do it as part of the listing process.
I really should be doing it with the listing agreement...I'll try to be more on top of it! (if its my own buyer, then I get it immediately) But I always, always get it by the offer.