Jebao's pumps seem to get good reviews. I have 2 rw15 and 1 rw8. So far so good. But it would be better if the dosing pump had been out for a longer period of time. Unless I find some bad reviews I will probably get one later this summer and test it out. One of my 3 tanks sure could use one, especially with 4 pumps. I will monitor the usage daily to see if the dosage is correct and do more frequent testing. If it works and think it will 115.00 is a lot better than 400.00 plus for other 4 pump dosing pumps. This Jebao company seems to be one of the few mfg. that price their product reasonably. Of course quality is very important, but only time will tell. I'm so old I remember when no one wanted to buy Japanese products.