I have one. I got it in the late '80s and it certainly was a blast. The 50 round drum was kick ass to unload, but time-consuming and hard on the fingers to load. Heavy too. I was a bit rough on the gun (teenagers!) and broke the stock at the neck and it has sat in storage ever since. I don't know what they go for now price wise, but I remember paying about $250.00 back then. If they are much more than that now I would skip it as you can have the same amount of fun with a 10/22.
Where are you finding one for sale? I could use some spare parts!