This is AMAZING! After using run of the mill magnetic cleaners and wand style steel bladed scrapers on my glass tank, I had gotten to the point where I was not looking forward to glass duty. It's messy and only marginally effective. I received this in the morning, placed it in the tank, and 5 minutes later, all my glass was clean. DONE. It WORKS. This is only useful for flat pane tanks. I don't think this would work well at all with rounded panels of any kind. It does come with both a stainless steel and plastic scraper attachment so you can scrape your plastic walls as well. I highly recommend you pull this out of your tank after use. It will last much longer. Whatever you do, don't leave the the side with the blade pressed up against the wall. I can imagine this would ruin the precise angle and pressure being applied over time.