Crystal Cable - Have you heard or compared them?

Yes, they are light and flexible and I've used their MCH sets for a while. No complaints.

Kal

Have you compared them to other cables?

I have tried the Micro and Piccolo in my system. I normally use the Oritek X-2 or CRL Silver ICs from my DAC to preamp. I tried both the Micro and Piccolo and can say that both are very good cables. They are very neutral and let through a lot of detail. I also like the fact that they are well shielded and very flexible cables. Overall I preferred the Micro and have been using this exclusively for the last 2 months or so. I did try the Micro and Piccolo in my system together. I placed the Piccolo between my preamp and amp. While the sound was great, I felt the combo was a little too much of a good thing together. I preferred the RSAD Poemia!!! or CRL Silver between the preamp and amp instead.

I tried a pair of the interconnects and speaker cables last year.

They are well built. I found both to be neutral, transparent, with their strength in the upper mids. I did not like the high end; it reminded me too much of Valhalla. Both lacked bottom end extension. These comments are based on use in a couple systems here when compared to some other well known cables. YMMV

They are not cheap and IMO there are other cables offering more for less. For the money Acoustic Zen, Analysis Plus, and others are better values.

Disclaimer: cable seller

It matters what you enjoy. I have tried Tara (all the way to the ZERO line), cardas, DIY models, WireWorld, etc. and I am all in with the Crystal Line. I am gradually moving to the Ultras, which are VERY expensive. What I love about the Crystal Cable line is that you never tire of their sound like I have noticed with other cables. They are always transparent and neutral and more like live music than any cable that I have heard. They do reveal system limitations though, so the better your equipment, the better the sound. The only non-crystal cable I have (and will keep) in my system is a JPS Aluminata cable for my conditioner that all of my components feed into. The Aluminata smooths out any "rough" spots that seem to be an artifact of digital sources. The Crystals open up the sound to such a degree that I needed the Aluminate power cord as a way to smooth out the sound to make it more lush and pleasant to very long-term listening sessions. Even the JPS Kaptivator is a good choice and much less expensive. I used to have a Kaptivator, but found a way to move up to the Aluminata. The Aluminata is better, but he Kaptivator holds its own and you can sometimes find them used for around $750.