We went to a practice event hosted by TORC 2137 for the second year in a row. They had a full field built. I've watched a lot of scrimmage video, and I'm pretty convinced it was the best practice field I have seen. They also had their machine shop open and many team members on hand. Really great hosts!!
I'm going to keep things general... There were only four of the teams present actually using the field; the rest were working on their robots. Out of the five (us and the other four) there were two high goal shooters and only one working on scaling.
There were no matches, just an open field you could use as you needed. My thoughts: The visibility was as bad as expected. They had metal elements as opposed to our wooden versions, and we were glad to test them out; we didn't notice much difference except that the moat was easier. We are adding extra reinforcements for our driver's station laptop, because robots were slamming into the low goal with force
(which they graciously took in stride considering the work they put into that field.) We noticed some connection issues and such as have been mentioned on CD and have added protective material under our electronics (the foam you use under electronics in R/C planes.)