I can't say anything either way about the drysuit, but I know Monarch purchased HH ski gear for it's employees a couple years back and most of them I talked to said it sucked. Would soak up the water and get soggy and heavy...
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Helly Hansen is a Norwegian company that has been making drysuits longer than any company I know of. I wore an old school Helly way back in 88 with a big brass zipper on the back. The one you are looking at is an inshore small boat-racing suit for sailors. That said they don't make suits specific for rafting or kayaking but I think you would be dry.