The Fireflys are basic catamarans they have no enclosed main cabin area, and are what we call open deck catamarans, sportive boats, which can sail very fast, but just as easy can be tamed down to a relaxed chill out charter speed.
Sailing in Thailand/Phuket with a Firefly invites you to go sea camping, with a few luxuries like a fixed toilet, built in ice boxes, enough space down below to store your luggage and provisions.

The butt’s and iff’s are, you have to be really an experienced preventive thinking sailor, also your wife or friend, who is the crew, next to that make sure and be honest with each other, that you can endure a rough way of living, ergo sea camping, living under the stars, cooking on a single gas burner, everything is supplied, but really everything, so you can travel light.

Compare the Firefly with a Porsche or Ferrari, those cars are great to drive in, but you have to sleep outside in a ditch , or go to a hotel or the many bungalows the islands have on offer.