I bought one, and I regret it. Very, very horrible - they didn’t even come close to getting the right sounds in the movie! Stay Puft was al lot better. To me, it’s not even worth $5. I’d try and wait for it to go on sale if possible.
I like the plush Slimer personally, I got one for my birthday. I’m actually glad they didn’t just insert the movie theme like StayPuft did. The sounds may not be super movie accurate but they are ghostly and disgusting. Plus I don’t have him on display with the sound constantly running so that really isn’t a big deal. He’s instantly recognized as Slimer by everyone who’s seen him.