Hi Lemmy!
Difficult to decide when the advices differ this much...
I have a Rosso Mandelo my self, along with a Rosso Corsa and four other Guzzis.
I love the Rosso Mandello, both as a commuter bike as well as for longer tours. It's heavy, yes, but easy to handle once you get used to it, and there are mods that can be made.
Wether you will like it on longer trips or not, depends a lot on how you ride it. It should be ridden actively, preferrably on curvy roads. I've had several day-trips ranging from 500-800 km a day, without really getting pains anywhere. Continous speeds above 130 kmh is tirening though, due to the wind pressure.
For this purpose, the biger fairing of the LeMans is better, -or a BMW or something...
Spare parts are easily available, especially from German eBay and dealers, and I do not think they are that expencive. The bike is easy to maintain, and given some care I would say that it's a reliable bike.
The V11 is built for crossing the passes of the Alpes or cruising along the fjords of Norway!
I am sure there are better bikes, both regarding reliability as well as comfort, -especially for the passanger!
But to me it is more than good enough, and no other bike makes me smile broader on curvy roads than the V11 with open Mistrals mounted!
But the choice is yours, Lemmy! Let your stomack decide, and enjoy whatever decision it takes... Good luck!