I've been using this AIO for 2 weeks now. Its cooling an i5 9600KF boosting to 4.9ghz. Under full load (100% all cores) it stays under 73 degrees which is actually really good for such a budget liquid cooler. Before this i had a single fan tower cooler and the CPU would hit 90 degrees under full load after only 5 minutes.
The fans on the other hand are terrible! They are extremely loud and sound like the bearings are grinding intermittently. Even after applying extra washers the fans sounded like a 20 year old Hard drive thats failing.
If you are after a cheap decent liquid AIO then this is still a great choice but beware if you are after a quieter experience. The fans are a real issue and almost unbearable when not using a headset.
I will be changing the fans to some Noctuas in the future.