The best machine available if plumbing it isn't an option.
Positive Product Points
No need for plumbing. Excellent consistant results.
Negative Product Points
Drip tray feels lower quality than rest of the machine (minor point).
I own a Vivaldi II at home, but as a physician I was spending every third weekend at the hospital without my espresso. I took the jump and bought the Mini for use in my office and have been thrilled. I was concerned that the pump would be louder than the rotary pump but it wasn't. I was also concerned that the water would be difficult to fill, it isn't. The machine produces amazing shots every time. If you can plumb the machine in I would skip the Mini and go with the Vivaldi II. I did get the pre-infusion chamber and am ready to get the update for pre-infusion on my home machine now. It doesn't make the shots better, but does increase the odds of a great shot. The staff at Chris' coffee were excellent in answering all my questions and helping me prior to the sale. I highly recommend calling them if you are even considering this machine.
Easy, shipped well packaged, they even called to let me know when it was shipping.