I'm running one to dose AFR and Brightwell's coral inertia NRG into a 400~ gallon system. Its been running the AFR for a month now with no issues and the NRG for a week. Minor complaints; you cant set your dosing at a specific time, and theres no option to set up specific days - so its an every day or nothing kind of doser. After watching a few of their videos its obvious that thats by design though, they wanted to make something that was approachable for people who didnt want to program a bunch of set points. I haven't had to rely on the sensor in it yet to tell me to refill my dosing containers, but if it works as intended its a nice feature as we've all had those busy weeks where we just neglect to check things like that. All in all its a pretty nice dosing pump, especially considering its price point. I've used the cheap jebao dosing pumps from 10 years ago, DoS, vectra, bubblemagus, smartreef - this thing works as good as any of them for just simple dosing and was very straight forward to set up. The priming issues and leaking issues are almost certainly all user error. I've encountered both, and both were my fault. The tubing really needs a good clean cut to seal up to the push connect fittings well which is where I encountered a leak, and the tubing needs a bit more force than you would think when pushing it into the connectors to lock in which is where I encountered the priming issue when setting the first head up. If they push a firmware update giving us some more advanced programming abilities I wouldn't hesitate to buy a bunch of the 4 head pumps for things I need dosed on a more irregular schedule.