To be frank, I have only tried two different diatonic harmonica models: this and a Chinese-made harp from Mud Puddle. The former is clearly better than the latter, in my opinion. I have been playing these Special 20s since December 29, 2018 as a self-taught blues harper and these babies are tough as iron nails. What I meant by that is that for practice from 10 minutes to one hour each day, the harp is just a workhorse. The pitches for each hole on both reeds don't go flat and it still retains its responsiveness. As for the harp itself, in terms of what makes it famous, the response is astronomically good and it's very air-tight despite the rasp in its timbre. For its comb, it's actually fairly smooth even though you can cut your lip on it sometimes. Despite not being known for this next part, I just want to give this away. The Special 20 may have the best timbre for any diatonic harmonica. This may be controversial, but let me explain. Since the inception of the internet (as far as I'm concerned), this harmonica's timbre is described as being mellow and/or sweet. I never saw where they were coming from. From the Special 20s that I've played so far (C, Bb, and Ab), they all had a warm, powerful sound with a raspy tone. That raspiness is often overlooked, but it gives the harp a distinct and dark timbre that is just made to play the blues. Just a heads up that the bends will sound growly at one point or another. There is only one other gripe I have with this harp which isn't the comb. My Bb has a slightly angled top cover compared to the other two. Which had me make a "conclusion" that some of them look rushed. However, my Bb played extraordinarily well and is my favorite key for the Special 20.
Harmonica Playing Pichu