These are heavy duty aluminium hull, jet drive RIBs designed to work in the surf and overfalls around West Wales.
They need lots of power (450 hp for a moderate top speed) and are expensive. They are cetainly tough, but I don't know how suitable they are for general cruising. You may get a better all round result with a more conventional setup.
If you particularly want an aluminium hull, some manufacturers offer this an an option (off the top of my head, these includeRibtec, Ribcraft & Delta).
Bear in mind that a RIB is not going to be heavy enough to smash through any serious ice, so there's no point trying to build an ice breaker. Alan Priddy took his standard Ribtec through some pretty serious ice during his 1997 Atlantic crossing without doing any damage to the boat.