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I got one about a month ago, so far I love it. Takes very little time and honestly most of the time my I have my daughter use it while I'm doing the wc's. Gets her engaged with the hobby and makes her feel like she's helping. I think I got mine for about 15 bucks..
I forgot to mention, the one I got had a scrubby side for glass and a soft side (they pop on and off) for acrylic. Make sure you done use the glass one on acrylic tanks... Apparently that's bad
I bought one of them, and while they're pretty practical for a deep aquarium full of water, it's so much easier and faster to just take a scrub pad to the sides and front during a water change.