Absolutely not worth the money. Maybe worth $200 imo. Terribly tuned. Circular tonefields are clearly the work of an uninformed builder. They seem to mean well, but they offer a terrible product at an offensive price.
While (as a non-maker) I can't say for certain that it is impossible to make a good-sounding Handpan with circular tone-fields - in general (and I believe this is true of every known "well-tuned" HandPan), the tone-fields are "ellipse" shaped.
You should be able to find more info on the why's of that if interested with some googling.
Additionally, as noted HERE (regarding these Vietnam pans) - the hammer work of the shell on a decent sounding Handpan is usually very smooth. Whereas these are very "nobbly". Another thing to look out for.
Tonefields and dimples should be slightly eliptical. This shape makes it possible to tune 3 frequencies on each note.
Hard to say what makes a good handpan. Check out as many youtube vids as you can (use nice headphones if you have them!). Check out Halo and Hang vids. Check out SPb, Asachan, BEllart, and CFoulke. There are also a number of other excellent makers other than the "Top 6". From there you should get a sense of what the signs are of a well made handpan, but generally:
-tonally balanced (no weak or weird notes)
-a "ceramic" feel and timbre, a result of the important nitriding process. overall a reduction in the metallic, steelpan blare. (this varies, Spacedrum and Innersound for example have more of this metallic sound and are not nitrided -- almost more of a handpan-steelpan hybrid.)
-nice and smooth.
-in tune. pans can be tuned as exact as a grand piano and can/should sound like a bell/harp/c