I bought this to learn CBA. I intend to keep it as a travel instrument if I ever upgrade to something bigger.
All the notes are in tune and everything is working properly. I placed a bit of tape on the "black notes" to help me learn. This accordion sounds like a concertina. Some people will like that. I prefer the multi-voice sound, but we can't expect registers at this price point.
There would have been room to include a fourth row of buttons and a few more nores at the end of the scale. This would have increased the price a bit and I would have paid it.
All-in-all, I'm quite happy with the purchase. Thomann was prompt with shipping. It only took four days to arrive at my home in a rural area of the US west coast.