Appearance and Size
The Enso is still mostly plastic when it comes to components, but it has a stainless steel outer layer which lends to its improved appearance. The unit also comes with a cloth which is recommend for any cleaning, which is helpful as the mirrored finish does show fingerprints pretty easily. It really does look nice and is a huge upgrade in appearance to my other SodaStream unit. As for size, the Enso is a little slimmer at about 3.5 inches wide on the body and 4.5 inches on the base. Height of 16.5 inches. Overall, while height is the same, the Enso width is about 3/4 inches thinner than my other unit, so takes up a tad less space on the countertop.
Function
The Enso does not require power, as you simply push a manual button to carbonate. This does give you the convenience to put anywhere you want, regardless of whether you have a power source. No having to deal with cords or plugs, and makes the unit easily portable. For carbonation, I typically do three pushes of the button which leads to a healthy level of carbonation -- probably equivalent to "level two" on the electronic OneTouch version. I personally do not mind this, but if you do like the convenience of an electric system that does the work for you, the Enso will not be a good fit for you.
What's Included
The unit does come in a nice box that would lend to gifting, and the unit itself is wrapped in a mesh bag which could be reused if you ever have to store it or pack it for a move. The unit comes with a plastic 1L dishwasher safe bottle, a full CO2 quick connect cylinder, and a cleaning cloth. I would have liked a glass bottle, but that's not an option with the Enso (nor any SodaStream that I am aware of).
Refills
Personally I do my CO2 exchanges through SodaStream directly via the mail, as I live in remote area and it's just easier for me. My other CO2 cartridges are the screw on ones, not the quick connect, so by getting this unit I'll have to invest in a few new quick connect cartridges for the exchange program.
Overall, would recommend the Enso to any carbonated water fan that wants a unit that blends both beauty and function. Glad I got this unit and look forward to the visual upgrade it provides my kitchen.