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The concept is really good, I specifically liked the reciprocating motion, unlike the orbital action in a similar machine from another well-known brand. The power is sufficient for finishing and polishing work, but the implementation of the power switch, speed control, and the color indicator settings is a C-grade at best, if not worse. I first had to scan the manual and run it through an auto-translator just to figure out the settings. In principle, I managed to set up three colors for the speeds fairly quickly — green, yellow, and red (increasing). But it's still not very convenient to operate; the speed switching cycles "in a loop with a full shutdown," and when turning it on you have to catch a split second to either hit the first speed or the last one you set. And during operation, once it's been on for more than three seconds, you can't change the speed without turning it off first. It would have been much simpler to just make three buttons — the adjustment is discrete anyway, and only has three positions. It's for this "over-engineering" that it gets a C. Overall, I haven't even opened the consumables yet; while I still have time to return it, I'll be thinking about whether to keep it — what will outweigh the other: the need for the machine itself, or the irritation from the awkward controls.
