Discussed this thread with Andy yesterday,whist we were descaling the bottom of Pal a mine.[Arvor 25 ]....Boat is capabable of 22 mph [empty of excess gear,and with a clean bottom ].he says however,"its not comfortable at that speed and could be inclined to veer suddenly in anything but flat calm".It is after all semi-displacement and not designed as a speedboat.It performs at its best at 15/17 mph.and is comfortable;safe and economical. you can use it single handed from a mooring,especially with a bow thruster.Its economy under all conditions is excellent.He further commented that the shaft drive,as against his previous twin outdrives,is saving him almost 2 k. pr year,in maintainance servicing and prop replacement/repair...He has left skid marks and chipped rocks,all over the coast and creeks of Dorset/Hampshire... The moorings at Cobbs are in the region of 3k p.a...Although he has in the past been a frequent "boat changer" he is totally happy with this one after 2.1/2 yrs. It had some niggling faults at first {cured I am afraid,mostly from his own pocket ! }..But someone purchasing 2nd hand would have had all these sorted...hope this helps in some way..only too happy to answer any questions {except on how to catch fish.! ]...jack