Monster M1500 IC How good are they?

With all due respect to the first two people who responded to your inquiry about the Monster Cable M1500 interconnects neither addressed your question about these specific cables. I own two pairs of the M1500's, and they have been integral parts of my system at various times and in different places in my system. I have also owned Monster's M850i, M950i, and M1000i cables. My system now uses Audioquest Lapis X3 and Emerald X3 cables.

The M1500 cables are in a different league from their much cheaper brethren. Their build quality is substantially superior (they have very sturdy yet flexible outer jackets) to the M850i, M950i, and M1000i cables. They were also much more expensive new.

As for sound quality, I would say that they are a fairly good and neutral cable. When used between my preamp and amp, they gave the best results: neither adding nor subtracting much from the signal. I would say that they compare rather favorably with the Audioquest Emerald's that now reside in my system.

My only complaint with the M1500's is the turbine connector. While they are designed for a very tight fit, they must be carefully detached in order to avoid damage to the RCA jacks on your equipment. This is a problem that I have found with all of the Monster cables listed above.

These cables can be a bargain at their current used prices. In the same price range I would also recommend the Audioquest Emerald (either in the original or X3 variants).

I personally have been very disappointed with monster cable. Their business model seems driven by marketing, not engineering. That debate aside, for the price of those cables you should get WBT connectors, instead of turbines. Both are RCA's, but the wbt's tighten up for a much better connection. I use Siltechs, which have wbt's, but most high-end brands use them or similiar design. To get an idea check out this link:
http://www.siltechcables.com/home/home.html

While I would agree with most of the statements regarding Monster's cheaper cables, the M1500 is in a different league of its own. In fact, one of its strengths is actually the connector. It uses a solder less design that was employed on the Sigma. This is the same cable that Thomas J Norton has used to review audio equipment in Stereophile magazine.