Hi Rattod,
Maybe alot of the Rocket forum users are more riders than spanner heads?
I haven't changed my pads on my Rocket yet, as it's new and only done 2K miles. However, my experience from owning a Triumph Sprint was mixed. I'll explain: I fitted new discs as the originals were quite worn, and fitted standard 'fibre' type pads and these worked quite well. I later fitted sintered pads, and whilst these did provide more stopping power, I was quite concerned at the rate that the discs appeared to get scored. Since the discs are expensive on any bike, I'd wish I'd kept to the original firbre pads that I started off with.
Don't know if that helps any, as it's just generic brake / disc experience.
Cheers
Steve