I have both on two different racks (Edstrom and RBI). I can't tell any difference nor can the rats, lol! I've not had issues with either one. The Estrom have a small angle cut on them that keeps the tip that is depressed to released the water from being activated as easily. On the RBI version, the tip that is depressed to release the water is completely exposed out the bottom of the valve. It isn't a big issue that I've found, but it is worth noting as a difference between the two. The only "issue" I had with the RBI version was getting them; there was a production back-log/shortage when I ordered mine and it took about three times as long to get them as projected. That was pre-holidays so I don't know if that's been ironed out or not. Otherwise, you can't beat them for the price point and as far as quality, mine have held up fine for the past 2 months, so for whatever that's worth...