There the same as Aquatop filters. I have 2 Aquatop CF400UV canister filters that have been running well over a year with no issues. They keep the tank water crystal clear and have a TON of room for media. You just have to be easy with them. The plastic they are made from is thinner than big name brand filters. As long as your easy on em they are great! Check out Truaqua's website for Aquatop products!
SunSun filters are great for the price, I've owned the hw-302, and the 402B. I loved how quiet they were, but I sold them when I got my Odyssea CFS500. I would definitely buy a SunSun canister filter again!!!!