Bests & Worsts Reviews from Amazon

This is my second DeLonghi EC680 Dedica, both were purchased on Amazon. The first I bought at a discount from Amazon Warehouse. I returned it after receiving it without all of the components and after noting that the on/off Button seemed to be deteriorating within the first week's use (after about the 10th double-shot I pulled). Today, I finally opened the new one I purchased after returning the used one. Upon following the "Setting up the Appliance", wherein I turned on the Steam/Hot Water spout, the machine immediately started making a loud, thump, thump, thump, thump... turned it off, made sure I had the water tank securely seated (it was), and started again, thump, thump, thump, thump... after about 7-10 seconds of this, water starts spraying out. But under what seems like unwarranted pump strain, as I listened to the machine, I felt that even the used machine bought at a discount sounded less defective than this. Since I already know this machine is capable of making an incredible Colada and Ristretto, I will return to Amazon to see if I can finally find one that has everything and functions properly.