Re: S2 7.9
I'v sailed 7.9s and raced against them for years. They perform very well in waves and chop. The boat has a big main, you can actually sail sans jib when wind is over 20 quite nicely.
The down side is that the boat can be a little under ballasted. Small jib full main combo to about 20 knots works. Surfing with board up downwind in 15-25 is a blast. For my money it is about the fastest trailerable out there for reasonable money (ok the Presto 30 is faster but add another 80K).
The carpeted headliner is a minus. They tend to get moldy and are a pain to remove. The glue used seems to bond rather well to the fiberglass. Another area to look out for is the rudder attachment. Most have been reinforced and/or retrofitted with stainless plates. They also have an inboard model. The BMW diesel tends to be problematical with age and expensive to maintain. Some of these inboards have been retrofitted with 1 cyl Yanmars which is a more reasonable solution. The inboard is preferable in bigger waves and chop as it does not come out of the water like an outboard prop.
It is not exactly a ling distance cruiser but it is a fun boat to sail. You can trailer it to where you want to go and happily live/sail on it for a week with little problem. I wouldn't be afraid to be out in a blow with one but for the big stuff you need some heft which translates into a boat that would not be trailerable. Some owners have told me that the boats with hull number 400 or higher are the ones to look at.