What is your opinion of this product?
As with all DR string, these are super quality strings. Good price for "coated" strings. DR Coated strings come in with a smooth & even tone, stay that way for a very long time. My experience is at least twice as long as non-coated strings. It's been my experience that most "coated" strings last quite a bit longer as is. The DR's have a (patented) unique quality to them. Allowing them to get a decent amount of bite, without ever being too harsh or raspy.
The only reason that I'm not giving them 5 stars is due to the fact that the color "chips" off after a period of time. Not significantly effecting performance of tone. Just a cosmetic thing. I would imagine that they would eventually loose most of the coating at all contact points, and would start loosing their tonal clarity. Since I change my string at pretty regular intervals, I haven't seen this happen. I can only compare them to their Bass "Coated" strings, which I have been gigging with for many years.