Hulls designs tend to differ drastically however, boats such as seariders and good old pacifics and arctics have similar characteristics.
Ive found that with pacific 22's in particular, cruising is relatively boring. It'll chug away at say 25kts all day long which, for a rib, isnt that fast.
Handling in terms of doing tight turns etc isnt particularly impressive because the weight of the boat combined with relatively low diesel performance tend to see it fall off the plane pretty sharpish!
And most of all, when cruising in the calm, the ride isnt anything special! Not particuarly soft or tranquil.
However, the minute the going gets rough, youve got a remarkable sea boat which will punch its way through some horrific conditions and suddenly become a dream to handle as all of the points mentioned before no longer matter! Itll go all day long like this and not blink an eyelid, as ultimately, i think this is what the boats underlying design aim is.
Similar scenario with seariders.
Average performance in every day usage, great when you really need to get somewhere in poor conditions!
You get the idea, even if the post has drifted slightly.....theyre not intended to be fun boats. Their for work and survival and their design reflects this in every way.
It may not be the nimblest on a nice day, but you can bet it will be quicker and safer than that other 5.5m RIB on a bad day!
You need to identify your need and then think, right, is this the boat for me? Am i actually going to benefit from these characteristics or am i just sacrificing comfort for the sake of it?
Oh, and with regards to the age of the design - why fix it if its not broken? Its done great so far so why risk fouling that reputation with what could turn out to be a re-design disaster?
Im babbling now but theres some more points to consider - hope this helps a bit!