It (was) a good show, and I watched most of the episodes, re-watching them now. It is nice to see, how the show evolved. The last 2 seasons, without the B-team, was strangely more entertaining, I must say. Not because they were not there, but because the change of the show. They used better gear to make the videos, more editing, more special effects. It was more professionally executed.
The reason for ending it is probably because they did not like each other in the beginning, and they don't do that now. It is surprising that the show is still running. Anyway, that was the last reason to switch to Discovery channel, besides Wheeler Dealers. Now it is down the drain completely.