Twin centreboards make for more space inside, four berths, porta potti, limited cooking facilities, all in 16ft. Quite heavily built (well we thought so). (we used a trolling motor on lakes). Thinking about it we were very fond of her and it was easy to forgive performance (or lack of it). If you are a scow sailor your natural competitiveness might find you getting impatient. Needed to go with the tide in Chichester.
Now that my ambitions have reduced I like the idea of getting one again!
There was a YM group trailer-sailer test including the Winklebrig (late 1980s, or early 1990s?*). Unfortunately I think YBW no longer supply copies of old articles, but perhaps someone on the forum has a copy.
The test included 4 or 5 other craft including a Shrimper and sporty Dutch open dayboat about 20' (name beginning with a C?) If I recall correctly they said the Winklebrig was nice, but its sailing performance (speed and close-windedness) wasn't as good as the Shrimper and other boats. I think it did say that there was also an open dayboat version of the WInklebrig available.
p.s. *Looking for something else I came across a reference which said 'Practical Boat Owner magazine reviewed a group of 19 ft trailer sailers in July 2001'. I don't know if that's the group test I (mis)remembered.
Shrimper 19 or Memory 19 better sailing boats for roughly the same money. Accommodation is limited on all of these compared to (say) a Leisure 17 - I know, I have a Shrimper and the bruises!