I bought four Mars standard Eb, A, D, Dnm (natural minor). I started with an Eb because I only had one Eb harmonica and thought I should have a backup. I really liked how smooth and compact the Mars was. It allowed me to play pretty fast. I decided to buy an A and a D in March 2026 for $31. Finally, I bought a Dnm because I already had Lee Oskar natural minors in Gm, Am, Bm, Cm, and Em. It turns out the minor keys are not labeled the same as Lee Oskar, so a Dnm natural minor Kongsheng Mars is the same as an Am natural minor Lee Oskar. The Lee Oskar natural minors are labeled for second position, and the Kongsheng Mars natural minors are labeled for first position. It was a disappointment getting the same key I already had.
Then I blew the 4 draw reed on the D. Admittedly, I was working it kind of hard playing Orange Blossom Special. The reed was not able to be repaired because it had metal fatigue (tested by plucking the reed). Someone said that you can buy replacement reed plates online, but I don't think it would be worth it for me.
After playing for a while, I found the Mars harmonicas to be a little quieter, which makes them neighbor-friendly. You can overblow them somewhat without adjustment (I'm not really an overblow player). On my A, 5 and 6 overblows work OK, but on 7 and 8 overdraws, I just get kind of a rattle. They have round holes, which may make for more comfortable tongue-blocking. I started playing these with Irish music, and they seem to work really well. I still like to carry these around with me.
Because they are so rounded, they don't sit on a table flat with the holes up; they lean at an angle. The case that comes with it is made of plastic and kind of boxy, like a Lee Oskar case, but doesn't have the connectors that a Lee Oskar case has. They don't seem quite as responsive as something like the JDR Assassin, which can play very loud and has excellent performance.
I guess they might be worth trying for a quiet, inexpensive harmonica with a very smooth feel. I probably won't buy more of them.

