Yeah, I wouldn't make any argument that the Spas is the best or most tactical shotgun or anything like that.
I used to have one, and as it goes for the weight I found it manageable. Sure its heavier than a pump, but if you've shouldered an M1 Garand, they are similar. I also found it to be fairly well balanced.
Then again I'm used to a 20lb rifle for highpower, so it really depends on who is behind the trigger. Mine also had the solid stock, which I found comfortable.
Overall, I'd agree its a collectors piece. Its got the movies and video games aspect and the cool look. Also if you consider yourself a shotgun collector, I'd say you should own one of these at least for a certain period of time. However, that may just be me.