I have a couple of simple questions. First, does the RTR Torment come with metal or rubber shielded bearings in the hubs? Second, is there any advantage to rubber shielded bearings over metal shielded in the transmission? I typically just get a complete rubber shielded set, and do all the bearings (just did it on a Tamiya TL01), but then I was told there was no point in the diff/transmission.