Originally Posted by two stroke mick
2) The tubes act as stablisers when being driven thus the nose of the boat stays in the general direction that you want.
Not sure about this one. Most RIB's at speed won't have much of the tube in the water (if at all.)
RIB's generally have a much higher load bearing capacity than a similar sized and weighted hard boat.
Stability at rest is much better.
Assuming tubes are intact, they are about impossible to sink (not that you can't get into trouble from water ingress, but it'll stay afloat.)
Generally lighter weight means a smaller motor can be used, yielding a higher efficiency than a similar sized hard boat.
If you're looking at a BW Montauk, be aware that they beat the crap out of you in chop. The cathedral hull tends to pound in the short stuff.