I feel I have to add my bit of experience. I recently did Dover to Lands End return in two days. For the first time, I really felt like I could and would have loved to keep going, rather than settling into a warm bath and resting for a few days at the end. Actually I went back to work the next day. I'm a veteran rider, tried lots of different machines, old British, Jap multi's, but this one, with a few mods, wins. The only other bike I tried with the easy to ride factor that shone out was the Triumph TT of a few years ago. It had a soft engine, incredibly easy to manoeuvre, a joy to ride, but I did not do any long runs on it.
R1100S; Y pipe + Laser, E=MC shox, rebuilt saddle, tall screen, good service = bliss. Oh, I only ever ride solo.

Oyster. 1999 R1100S. Almost original.