theyre good because theyre simple, thats it in my opinion, cramped, handleing capabilties of a bouncy ball on jelly, rust, corrosion of steel on alloy panels, weak in general, no axle diff locks, yes they have great axle articulation, but no weight to apply traction under articulation. its not that i dont like them, the basic concept isnt bad, a nice simple design thats easy to fix, great, in fact i quite like the series 1 and 2, but as soon as the series 3 came they started going downhill if you ask me.