4 stars for ease of use, because you have to assemble the hoses, flush it back after use (seems like a smart thing to do) and disassemble after filtering, which is not bad at all, but takes a minute.
Our water source was okay-ish, but not crystal clear, there was definitely green organic matter flowing out during the backflush after the filtering session.
We've been filtering at least 12 liters a day (6L per session) for 6 days straight, without any issues or interventions aside from changing the output container. All on one set of 2xAA batteries that are still good.
Zero hassle compared to gravity filters, works very quietly and decently fast - a bliss to use.
The bag that comes with the filter fits all parts and everything necessary for maintenance + some batteries which is nice.
Taste is perfect. Honestly tastes better than some tap water.
The biggest issue I have with the filter is the placement of the power button. I go moto camping and I pack the filter bag into long drybags where stuff basically lies on top of one another, that way I had the filter turn on on me once - fortunately when I was packing it so I noticed immediately and turned it off. So the solution is to take one of the batteries out for packing - and leave one in, so the door snaps on securely. This is not convenient at all and the battery door material does not seem like the toughest plastic, so I don't know how long it will last. For now it's good.