I don't have dishnet but I haven't heard anything positive about it. I am pretty sure they have bandwidth caps you have to deal with, so once you've reached your alloted amount you are screwed. If all you do is serf the web and email it might be an option, but if you do any kind of streaming it will eat through it quick.
I live in the Lexington area as well and had Windstream for a long time. They have been having problems in the area for a while and are trying to upgrade their infrastructure. I finally got tired of the slow speeds and the inconsitency and switched to TW/RR. I have DISH for my tv. The only problem I have with having DISH for tv and TW/RR for internet is that I can't get ESPN 3 or the Watch ESPN App.