These have become the standard purchase for my sitar. You get the high quality of the pyramid strings without the extra cost of buying the sympathetic strings everytime you need a new baaj (melody string).
I found the tonal quality of these strings to be great - I only wish that I could get a slightly thicker baaj - as I prefer heavier gauges. I can't find any other place for silver-plated steel, so I make do with what there is. However, it is likely that you will consider this a blessing, especially for people new to sitar - as the ease of playing is increased with these strings. (note: I can only say this is true for my sitar, but I get the feeling others have the same experience)
I switched to pyramid strings when I got my new sitar. I had trouble with the nickel/silver frets getting scratched by plain steel strings. For anyone else with this problem, the silver-plating does make all the difference, and I'm very glad I gave these strings a try. And so is my sitar!