I bought a set of 5 gang 12.4m Twose rollers in 2008. They are pretty good overall - heavy duty with plenty of steel.
The only problem I had was with the rack & pinion folding mechanism for the outer sections. Unless you keep the rack adjusted tightly to the pinion the teeth would snap off.
Main roller gang bearings don't last very long but this is more down to the nature of being so close to the dust than the bearing design itself. The grease gallery would wear, allowing the grease to come out around the bearing housing, then it was just a matter of time before the bearing itself let go. My Opico rolls on my current farm are just as bad for this.
Another well made brand is Cousins. Heaviest is the Contour (vertical folding) & I rather wish I had gone for these instead - I fitted a Stocks slug pelleter which needed folding flat every time I folded up which took some engineering to make it strong enough. The Sidewinder is a more conventional horizontal folding design.