Maybe not this exact model, but 20 years ago when I was a young gun in college for the first time, I got one of these because I hated cleaning the fucking shower and tub.
It worked about as badly as you'd expect. I don't know if modern versions are any better, but holy shit they're a lot more expensive than they used to be. I remember spending like $40 at the time.
I quickly learned to just wipe down the shower after use and clean it more often. Thing was fucking worthless.
Oh, yeah, those are crap. I went with scrub brush attachments for the battery-powered drill I already own. It cost like $20 for half a dozen heads of different sizes that chuck up like any normal drill bit. It's not as automated, but it's way easier and more thorough than scrubbing by hand.