Some of their challenges have been quite interesting, although in several cases they cheated.
Apparently the experts can request pretty much whatever "scrap" they want to be placed in the heap, but I think the rest is picked so that there are several things they could use to make the item. Eg. in this one they picked a table, but I expect there were quite a few items seeded that could have been used.
It says "application details coming soon", dunno what the rules are this time. It seems that all the teams are either workmates or somehow linked. If you phrased the application the right way you should stand a good chance of competing.
As for success, it is clearly luck of the draw - a) which challenge you get, and c) which expert you get (and their solution). I suspect they pair the more competent teams with the most difficult solutions.
Go empeggers!!
Gareth