Unfortunately, I've come to understand that FORM letters do little, if anything, to prompt action by an elected official. The flip-side of that is sending personal, hand-written, mail. That type of mail is generally read by the elected official in question. BTW, all of them are questionable/suspect.

I did, however, have a FORM letter sent to my Congressmen/women because I'm too darn lazy to write them a personal letter.