The compact design is great, and the install was overall easy. The installation video is very helpful. The only issue I had was after waiting 40 minutes and then drain the tank, the water just trickled out like others have posted. I assumed that there was still air in the lines so I opened and closed the faucet a few times waiting a few minutes in between the cycles. Suddenly you could hear the wastewater begin to drain out... I did not hear this at all during the 40 minute wait time.. so it actually wasn’t filling the first time around. So, I waited another 40 minutes and the waste water sound stopped … the tank was full! I opened the faucet and it flowed properly! All is good now. Its been working perfectly since and water tastes great.