I have sailed three similar sized boats on offshore
voyages. They were a 26 foot WOD (folkboat type) singlehanded from Nelson to Sydney
in winter, a 28 foot holman and pye from Brisbane
to Wellington also in winter and a 28 foot Ganley NZ to Tonga
My instincts based on the lines and displacement
of the virtue is that it will be one of the more comfortable and safe small boats to ride out a gale in.
The smaller the boat the more important seakindliness is. The folkboat
and the ganley where quite bouncy and uncomfortable. The holman and pye (much like a twister but heavier) was similar to a virtue in some ways and was a supurb sea boat that really looked after us with her gentle motion in all conditions. She was much more comfortable at sea (iirc) than an s&s 34 that I sailed across the tasman Hobart to Bluff and back from Nelson on.
Seaworthiness is different than seakindliness. On a boat this size I think ultimate seaworthiness more depends on the ability to survive a capsize
with crew and boat in one peice (but probably the mast
in many peices). And certainly the glass virtues look strongly enough built. An old wooden one might not be so good in this regard unless well maintained and those big windows and cockpit
Modern techniques like series drogues and stronger materials such as lexcan make small boats potentialy much safer than in the past.
I am sure you have also heard of Bob Nances voyages in his virtue. And Wanderer II's amazing voyages (she being almost a 30 foot virtue). There was also an older wooden virtue recently that did a climbing expedition to Jan Mayen Island. Something can be read about her over at attainable adventure cruising.