As a fairly rugged full keeled cruiser they are probably what many would consider blue water capable, years back we had one in our club that the owner were fixing up for that purpose. (in the end they came into some money and moved up to a Passport 40!)
As far as sailing, these boats apparently suffered from excess weather helm and many have had short bowsprits added to move the forestay ahead and alleviate the helm issues (they are not alone in that.. many Cat 30s have had the same mods)
I'm not sure that the construction quality is top notch nor if they were as 'heavily built' as they appear.. but I'm quite sure that a good number of them have done offshore passages. I believe some would be owner-finished; I think hull/deck kits were offered.