The proof of a great machine is in the quality of the coffee produced and this great machine keeps up very well with my 3 year old GS3. Purchased for second home in a remote location. Absolutely love the simplicity and the amazing quality of the coffee this can consistently produce. Seems more straightforward for achieving excellent results than the GS3, at less than half the price. Don't tighten the portafilter too tight in the head or it may increase channelling. The neon lights on the side are completely goofy, but you don't have to turn them on, thank goodness. Highly recommended.
No concerns. Shipped to my remote location and assisted remotely with the set-up, including solving a problem with one of the lights on the front that had come loose in shipping.