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I just bought two Potomac Vortex 80DLX kayaks (Sale $159.99 each) for my kids (6 and 8) to learn in. We live on a lake and these are their first "solo" kayaks. Had them out yesterday and they quickly had the hang of them. Stability was not a problem as they are used to being in our kayaks...as a passenger. Being that these are short kayaks and have little to no keel, they do not have very good directional stability. I figure this is good for the kids learning though...it will foster better control skills for them. I am happy with the purchase.
UPDATE: We were out yesterday and had a great paddle. The "turn-ability" of these kayaks makes it easy for my kids to recover from an errant manuever. On our return trip up the lake the wind kicked up and was blowing the kids/kayaks around. Keep in mind this is "hour two" of their experience level kayaking. After a bit of whining we got them dialed-in with repetivive "right"-"left" commands and they made great headway upwind in a slight chop. We eventually made it back home and the kids labeled the experience "awesome"! I am truely happy with these kayaks. The kids love them so much they got out buckets, sponges and soap to wash them after the trip! I just wish they were as enthusiastic about cleaning their rooms.