I recently sent e-mails to both Texas Senators, Cornyn and Hutchison. I made a suggestion about Social Security stuff. The specifics are not important.
A couple days later (yesterday) I got a response from Senator Hutchison. I expected it to be the typical "We appreciate your input" non-answer, but was, very happily, wrong.
The note was fairly long and explained several things about the topic. At the end it said they would keep my suggestion 'in mind' when Congress considers SS stuff. I was impressed by the length, the detail, and, mostly, by them taking the time to respond in that way.

I have not yet heard from Senator Cornyn.
Thanx,
TraCoun