i do not use mine for LBG but know the arancias well.
i have owned two of them, they are awesome boats and they go places that i would not take my 5.5 aluminum boat.
i have mine current IRB called ginga ninja with a 30hp 3 cyclinder, 2 stroke yamaha, it goes real well.
very stable, great for diving, fishing, skurfing and access to surf breaks, LBG spots.
they are very safe as they are made from hypalon which is much tougher than standard rubber on some other boats, also they have 4 seperate chambers. a stingray holed one of mine with a 110kg mate sitting on it, got into shore no probelm and then pulled it out. overnight it hardly deflated and still could have launched it the next day.
there was also a shark attack on an IRB about 2/3 summers ago up orewa/red beach area i think. they made it to shore on 2 chambers.
there are not many boats that can handle going through breaking surf waves. the ribs etc are all good for fishing but there is a trade off, they are heavier and not as flexible in the places that they can be launched, there is a reason why surf clubs use IRBs and not solid hull boats.
thundercats are all good too but tackle/stuff can go out the back and you have to lie down on them, IRBs you can sit on.
those blackdog cats look awesome too.
great livebait tank there also.
trademe is good place to buy, they get snapped up real quick or talk to current owners and let them know you are keen to buy, or talk to surf clubs and do the same thing, they replace them every so often. bigger surf clubs have more boats and more turn over of hulls.
you can clip the scuppers shut if you want to put on a buckle, otherwise do not worry about the water coming in, it will flush when you plane.
check out the arancia website, do a google search. great photos and details of the boats in action.
sorry this is more of a rant than i planned, i have not done much changes to mine except put the full tank up front as ballast and got a welder mate to make a rod holder.
use the chilly bin as storage and a game chair by sitting on it with gimbal under bum, works awesome!
last year i wrote 2 articles in coast to coast magazine about IRB game fishing.
blood splatters, gps, vhf tied in and chilly bin game chair
29kg wahoo
30kg wahoo
mates family outing on boat
fuel tank rod holders at front of boat