Hi all :)
I have or have had the following MEE products: M2 (two pairs), M6 (two pairs), M9 (four pairs, I used to give them as a present for friends, they're incredible), M11, M11+, M31, CX21, CC51 and A151. In addition to these, I've been able to test the HT21, too. I've NEVER been disappointed by them. Well, maybe the M11 hadn't the sound signature I love, but nonetheless I considered them a quality product.
I don't have much experience with top-of-the-notch audio products, so I cannot tell if Meelec products are top-of-the-notch, but I firmly believe they offer the best bang for the buck, specially the M9 which I consider one of the best audio products in the market due to its incredible price/quality ratio. I haven't found yet any better headphone for 20 bucks.
But probably the most important point with Meelec is customer care. I haven't found any better company in that regard, and that's the main reason I'm a fan :)