A friend has one, a 'Vector Vegabond' or so it says on the console. Neither of us know any more about it that that. I've taken it out in some serious sea's, including a F8 (i was, in fact, later that day out in my BWM 18!) and it handles superbly.
I must say, though, to me and my short 5.6m RIB anything nearly 2m longer will handle a big sea better. I've no experience what so ever of any other large RIB (plenty of experience of sub 5.5m though).
The boat had a 200 on her but Martin and i threw that away (literally - it was a Suzuki) and replaced with a 150 Mariner. Good for 45mph and will sit flat-out all day long whilst i have to work up and down a small swell in my shorter boat.
I'm jelious of the longer hull can you tell?
Anyway, i'll be interested to hear any more info. you find out. Equally if i can answer any more queries??? I think i've seen the same boat for sale in the back of RI mag.
Hope that helps.
PS: Pics of it somewhere on my website.