I've purchased a few. Any arcade tech is going to tell you they are hot garbage. The general advice is going to be that you really need to just suck it up and match your tube to the correct chassis which can be an exhausting experience.
*They are extremely cheap quality. Not only is the PCB cheap and flimsy, but the capacitors are junk. You can easily break off connectors and pots.
*They aren't truly universal. You really need to check your vertical and horizontal plugs to make sure they match. I believe Hor need to be 6-12ohms and vertical must be 1.3ohm minimum, but doublecheck my numbers.
*They don't label the circuits which can make life difficult when troubleshooting bad capacitors and resistors.
*They don't quite get you a good picture, it's odd I've had mixed experiences. On one chassis, after a full recap it's been a champ for over a year of regular use and has a great picture. On another one it oddly works better with one of my 27" than the 25" though Im gonna recap it when I get time. Yet another one basically crumbled in my hands and I had to toss. Try to find a reputable seller if thats even possible on Ali. Only a few places sell them.
Being completely honest, your experience may vary and if you're just looking for a quick solution without having to put any effort in they are not for you. Youre better off forking over the cash for a matching one, they usually cost $160-200. Dave over in the FS/Ft is selling a stack of them already recap. The folks at Klov can help you out, but uum, be extra nice and patient when asking for help over there.