When I first started playing TF2 (a few days before the official release) I quickly decided Dustbowl was my favorite map, followed by Gravel Pit. I searched for 24/7 Dustbowl servers all the time, and really liked the eGO ones once I happened upon them. I played for a few days before joining, trying out a couple of the servers, and met a bunch of friendly members. From my time as an admin on CS:S I appreciated the attitude of keeping the servers punk free and keeping people focused on playing and having fun rather than whining and trash-talking each other.
I haven't regretted it one bit, I love the community, love the players, and love having a consistent place to play TF2 with a lot of reliably good team mates.