I've no experience of the variant, but in terms of max wind speed, the biggest factor is the state of the sails, not the design of boat. If the sails are old and baggy, wind gives greater heeling force and less forward drive, so every time a puff hits, the boat heels over. With good sails, it will accelerate forward. With bad sails, you might find 15 knts uncomfortable. With good sails, 25 knts could be fine. It also depends on the size of sails, and if / when you reef them. If in doubt, reef early.
You confidence and ability will likely be the limiting factor for some time, rather than t