I have used the Sevylor on lakes for years and I'm very happy with it. With practice it tracks fairly well and you can't beat the price. But I wouldn't take it on any kind of white water or even much current at all. I too have heard that it is out of production. It's not an Alpacka but it is a step above the pool toy category.

I need to cross the Colorado River in the Grand Canyon on a trip I have planned next year. I wish there was something between the Sevylor and boats like this. I have an inflatable kayak but it weighs a ton.
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If you only travel on sunny days you will never reach your destination.*

* May not apply at certain latitudes in Canada and elsewhere.