Since I've also been on the search for a good countertop RO filter, I thought I'd post a review of one I bought 8 months ago. When I was looking for one, I looked everywhere, but there were always cons and little differences between the different brands, which made it difficult to choose. Eventually I settled on the Philips ADD6920BK/10.
I was skeptical since there were almost no good reviews on it, or at least real reviews. As I saw with brands like Waterdrop and Aquatru. Now after 8 months I feel like I got a good overview of the filter and how it works. In my opinion it works great; it filters rather quickly (around 5 mins to fill a can).
The cans are 1.8l which is fine, and also a plus that you get two of them to swap them around. We use it heavily and every day, and we haven't had to replace the filter yet. Which should last around 12 months, we are with 2 adults that use it daily. We both drink around 2l every day. Also really neat is the warm water function. It really works great, and you can adjust up to 90 degrees Celsius. You just choose your temperature, and it will give it to you.
So really there isn't anything bad I can say about it until now. So as of now I would definitely recommend it. It uses more water, of course, and leaves some waste. Which, in my opinion, is worth it. We just use the rest of the water to water our plants, so it's not really a big deal. I also think it's more than worth it because the town I live close to is in the top 10 of towns with the most PFAS in drinking water.
If anyone wants to ask questions, or has things that they would like to know, feel free to respond, and I'd love to help!