We're looking at moving to using Loupe in our software, we currently use NLog and the Log4View software by PROSA to view the logs in real time during development.
Loupe is vastly superior for logging at the customer end and recording metrics, however the live logging functionality is relatively lacking.
It would be great to see the hierarchy of logging categories (exactly as is available in Loupe Desktop currently) that we can use to control which log messages are added to the live trace. If you have a look at the Log4View software you should be able to see this behaviour in action.
This is currently the main missing feature in Loupe for our workflow (although it is a big one for us), I will raise new comments if I can think of anything else as we start to use Loupe more (we've only been going for a day or two so far).