The following observations were posted on Sailnet Forum and provide insights from a San Juan owner:
The Mark II is distinguished from the Mark I by the fact that coach roof & the deck are all at one level continuous to the edge of the boat.
San Juans are moderately well built.
It is a light boat compared to many of its competitors which makes it quick in light airs as the keel is only about 400 lbs. It is a retractable keel that swings up into a raised trunk inside of the cabin. When fully retracted, the boat only draws about 12 inches of water, allowing it to beach easily.
The cockpit on the Mark II is reasonably spacious. The mainsheet is on the floor at the stern of the cockpit when traditionally rigged.
There is a lazarette in the back of the boat for storing gas, anchors, etc. It is sealed off from the rest of the cabin so you can store semi-noxious materials there without concern.
There is a basic electrical system that consists of cabin lights, accessories and running lights.
In general, this boat should be considered a daysailor with the potential for overnight excursions.
Putting in and taking out is easy since you do not have to have a deep water ramp and no tongue extension is required for this boat.
Parts are no problem with this boat as there is still an active aftermarket and most parts have found modern replacements by major manufacturers.
In general the SJ 21 is somewhat unique in its class. There are an abundance of 21 foot pocket cruisers, but only a few other large scale manufactured boats offer the flush keel in this length. It does well in races in light airs, but is pretty tender in heavier air. It is a great boat to step into from dinghies given the easy of trailerability and the ability to overnight.
