I have Reinke S10 (second hand) but for very short time so I don't have a lot of experience yet
It is not a racing
boat but my opinion is that Reinke S10 is a good boat for cruising. We choosed this boat because of strong contruction, low draft
(1.2m) because we want to be able to cruise
channels a rivers too, use a small harbours, twin-keel so tidal areas are not a problem.
In my opinion the "sailing abilities" are good for a this semi-displacement boat. This boat sails
better in stronger winds (it's what she was designed for). It's not a good choise for areas with prevalent light winds.
One my friend also has Reinke S10 and he is happy with she.