I have bought a few. My FS55R trimmer which has untold hours on it has one now and it runs better than ever. The factory one had a weird issue I couldn’t seem to fix after 2 kits. The BG55 blower still has the factory carb, bought both these tools at same time
The first carb I bought for the trimmer was junk and went back. Different brand is perfect. Carb, line, air filter and fuel filter for $15
My MS250 had the hot start issue that plagues those saws. Chinese carb was recommended to me as a fix and it absolutely fixed it. Perfect in every way.
My Husqvarna 359 wore one a while til I could mod the factory 199 carb. It didn’t run perfect and the screws seemed to lack effect. Factory one is modded and back on it now.
It’s a roll of the dice. Some are crap, some are a fantastic bargain.