it might be the most comfortable c&v road bike i've ever ridden. with its frame two inches longer in wheelbase as compared to my g.record, it's made to tour, not shop.
i have suntour cyclone too and matched it with a shiny, new sunrace 6-speed freewheel off ebay. works fluidly and flawlessly.
wish my black frame was silver like yours. but i'll keep the vitus 172 over the 531. i'll go out on a limb and say it's better suited to my 160 lb frame.
enjoy.