Just because a design is 15 years old doesn't mean it is still not as good as, and maybe better, than newer ones.
Shoot, there's a early 90's Catana
48 up here (the design is now 20+ years old) that can blow the snot off just about everything in Puget Sound
While our St Francis 44 is more loaded for cruising, it, too, is a remarkably fast boat. Comfortable and dry, too. The first versions of that design are now 20 something.
Most of Lock Crowther's designs are older than that, yet are still killer boats.
These Seawinds are darned interesting boats. If the exchange rate was more favorable to the US and I was shopping
, I'd definitely be considering one.
As for "age" of a design; good design is timeless. E.G., it was only two years ago that Cutty Sark's 24-hour record
run was broken by Maltese Falcon. But, I'll bet you that Falcon wasn't loaded down with thousands of tons of cargo at the time!