A lot of people review this item and say that the switch blows out pretty quickly and I found this to be true. The wires in the switch box are attached by screws and the screws work themselves loose, causing the switch to short out and melt itself. Mine took about a month to do this. It's an easy fix and the switches are fairly cheap and readily available from pretty much any electrical supply depot (go for a specialty place, not a big box), or you can order one from Amazon. If you've got one of these pumps new, the best thing is to open up the switch box before you even use it, unscrew the switch and use a bit of blue locktite to keep the screws from working loose, then reassemble and you should be good to go. They clearly need to fix QC at the assembly plant.
Otherwise, now that I've fixed it myself, I've had this pump running constantly for nearly a year aerating my 30x50' pond and it works well. Throws a lot of air! It's quiet, I'd guess about 50 decibels (not much louder than a box fan), and while it gets warm to the touch, it doesn't get hot.
Overall, I'm pleased with it, for the price. You just need to be a bit handy.
Also, don't bother trying to get Vevor to send you a replacement part if your switch blows. I've been trying to get them to help me with a part for a different Vevor item and they're worse than useless. All they keep asking is could they please give me a partial refund and could I fix it myself? In the case of this pump, I didn't even bother asking when I'd read the reviews, I just sourced the part locally. If you buy a Vevor item with specialty, hard-to-get parts, buyer beware.