If you're thinking about buying a
polythene canoe ( that's "polylink", "triple tough" etc etc) then the
only one really worth buying, assuming you don't want a lifeless plastic tub, is the SP3 15ft 6" from Nova Craft.
This was mine:
It's stable when you want it to be and lively and responsive enough to be paddled in white water, poled, sailed, heeled over, basically a superb all round open canoe.
[video=youtube;jTx9Yjh4fTg]http://www.youtube.com/watch?v=jTx9Yjh4fTg&list=UURdd L3mkjOvJ3tAtVHpW-XQ[/video]
I had to get rid of mine, because it was simply too heavy to manage off the water on my own. It was a great loss and the light weight boat I replaced it with,( Nova Craft Prospector 15, in RX Lite) that cost double the money, was a very poor substitute.
Luckily, my mate bought an SP3!

He's a big lad, hence the boat sitting a bit low in the water
But every chance I get, I'm paddling his SP3 when we're out together
In fairness, there are two other polythene boats worth buying; one of which you've already mentioned (I assume/hope you are talking about this boat and not the "adventure")-the Explorer from Mad River, which comes in 14, 15 and 16ft models in "TT" (polythene) and is also a very good all rounder like the SP3 but simply doesn't have the looks or the quality of the Nova Craft offering and the Venture prospector 15 or 16 which paddles pretty much as well as the SP3 too but in spite of better looks than the Explorer, falls behind in quality and consequently, resale value.
I now paddle a Mad River Reflection 15, in royalex. A boat designed for flat water,( and another at twice the price+ of an SP3) gentler rivers and lakes and lochs. It's superb for what its aimed at, sails well and is fast to paddle but not a patch on the SP3 as an all rounder.
If Nova Craft had an SP3 hull in royalex lite, I'd consider selling one or two spare body parts to fund the boat
good luck and whatever happens, don't buy that Tribord thing or anything like it.
Steve