Nice view of the valley, Prokop!
As far as the hack, a few years ago I bought a 550 and the seller made me take the hack as part of the deal, I really didnt want it as I had no room to store it. I just didnt think I would enjoy riding the bike with the hack bolted on it.
Listed the sidecar on CL and sold it immediately, I was surprised how much interest there was to buy it! No regrets.