I have sailed only a few hundred miles on an ORMA last winter. It was a blast and a highlight of my sailing life but I wouldn't want one for cruising. As stated above the floats are flat and proportionally very low. This makes it very hard to slow down and be comfortable. So you have to keep her loaded up ALL the time or the windward float hits the approaching waves. The boats are only for amazing sailors who can sleep in a washing machine.
Before your client goes the tri route I would talk to real delivery skippers of these things and get the good inside info from them. I would think something like Dick Newicks Traveller would be much better for a cruiser. They are still trying to sell the fad one built in Queensland. It's a gem.
NEWICK'S BEST, the 52' TRAVELLER is for sale in Auckland. Completely ready for sea, better than new. Full details at www.trvlr.net.nz