Got my first RDM (Loft Bico 430) yesterday for my smaller Loft Blades after having a mast failure 2 weeks ago. Noticed immediately just how much easier it was to downhaul although the luff is slightly flatter than with an SDM. Rotation is definitely smoother with the RDM too. The only p1ss around is the mast shim that came with my boom - it's a real pain as the shim doesn't clip onto mast neatly and then the boom head doesn't clip into shim neatly - excuse my french but it's a f@#king hopeless design.
Anyone know of a good quality shim that will fit a Unifiber (same as Aeron) head.

Here's the culprit