Flipper Mx Magnetic Aquarium cleaner... Really safe for acrylic?

[mnl119]

So, I've used magfloats for years... gotta be very careful about scratching acrylic as sand gets caught in the pad sometimes.

I ordered a Flipper Max magnetic cleaner. It looks like it has a nice soft pad for cleaning the acrylic, but it has a metal blade on the other side. I'm afraid to try it as I'm afraid of scratches.

Are these things really acrylic-safe? I'd appreciate some responses of those with experience.

 

[Sleeping Giant]