Send To Kindle And Plain Text Files

I have some older fiction in plain text files (these go back to Usenet) and I am thinking about using the Send To Kindle feature to get them onto my kindle.

Does anyone have any experience using Send To Kindle with plain text? I am curious how they end up? For example, do they reflow?

I tried searching for a comparison of how how well various formats convert by the service but I was unable to find anything.