Obviously I'm an avid multihull fan...but go sail an RC version for a couple of months and you will quickly realize the limitation. They are certainly fast and exciting but you go swimming a lot. A monohull with a big dumb blob of lead on the bottom leaves much more time for beer.
However, I will probably build another good size cat or tri that will use a US1M rig in the next couple of years. I had one a couple of years ago but I sold it in lieu of creating this one.