This is one of my favorite sets ever produced by the Lego group. It came out at the beginning of my dark ages, so I only purchased one while it was available in the stores. Big mistake!
The boat itself looks like it could really sail the seas; it could at least make the trip from Scandanavia to the British Isles or to mainland. (If the falcons are German as I've always suspected, then they made it to northern Germany). Too bad the set didn't come with some French soldiers for the vikings to beat up on!
Great figures, great boat, great set.
On a side note, if you're looking to obtain one of these, I've found the most cost effective way is to purchase the pieces separate. The boat hull pieces are cheap, and everything else is widely available. The two blue tower fortification pieces are the only somewhat rare piece besides the sail. You can find them for about $.50. The figs you can get for about $2-3 each. The sail is the only downside to this method. I haven't found just a sail for sale yet, so a bunch of my boats are at the harbor permanantly.