I purchased a Zaphir chime a few years ago and it pairs perfectly with my Zenko. I saw the Koshis on sale and decided to take a leap a buy several. Huge disappointment for me when I compare them to the Zahpir. The Koshi feels hollow and lifeless to me compared to the Zaphir. Because it's lightweight, it can be easier to travel with, but that's also its downside for me. The cord, outer shell all feel more like a 'toy' than a durable, lasting, resonance holder. I may try to add some type of weight to help ground these chimes, not sure, but if I'd know how different this feels compared to a Zaphir I wouldn't have made this purchase. I don't think it's a 'bad' product, I think it's just not aligning with what I've experienced in another brand.