This is my first handpan (so I'm amateur), and I order two handpans from thomann to compare. (Thomann D - Celtic Minor and Harmonic Art HM10 GG).
The comparison showed, that Thomann model is better (for me) because: the sound resonates better and longer, because of d-minor sound is more nostalgic and melancholy, tones sounds cleaner and less ''finger noise'' even when you hit on the edge of the separate rings. The ding tone sound deeper and longer. An extra: you have a very nice bag in the set.
p.s. 30 days full ''thomann money back guarantee'' works only 2 weeks from delivery. If you want to return between 15-30 day, you will be charge postage fee.