-So they are probably the HRC pads. Yup, they are good and maybe even the best brake pads for the RC.
-Braided lines are always good on any bike to get rid of any squishy brake line flex.
-Revalved forks and Ohlins shock with the DK link will make the bike way more compliant than the OEM stuff. Yes they are very good mods to have.
-With the different link the RC tended to lean over a bit more on the kick stand so the extended kickstand returns it to the OEM lean angle when parked.
-Sato exhaust was one of the most sought after exhausts systems for the RC. The only problem now is Sato no longer makes it and finding replacement parts can be a challenge. There is a guy that I have heard of who can repair them though if need be.
-Honda installed a soft rev limiter on the RC which killed some of the power as you were getting close to the hard rev limiter. By removing the soft rev limiter the bike pulled all the way to the hard rev limiter with out any drop off in power. (a simple explanation) Its a good mod to do if you are wanting the most out of the bike.
-Honda also installed a flapper valve in the air snorkle to cut down on some of the noise the motor makes. It messed with the fuel injection a bit robbing the bike of some power in the power band. By deleting it, it smoothed out the power band. Another good mod to do.
- Adjustable clip ons and rear sets allows you to adjust your hand and foot position for your preferences. Really a comfort thing.
-CRG shorty levers, some people prefer them, some don't. Personal preference thing.
-Frame sliders, nice if the bike hits the ground. They can deduce damage and save critical things like the side radiators from catastrophic damage.
The last question on how it fairs against the GSXR 750 (depending on the year, not sure if Suzuki is still even making the 750 anymore) is in my opinion anyway a subjective one. A relatively stock RC will make somewhere in the neighborhood of 125 BHP + or - a few. The RC is a bit on the heavy side too when compared to the GSXR. The RC will make more torque and have quite a bit more low end stump pulling power. I believe both bikes are probably close to each other when it comes to top end power. So, how does it compare? In my opinion that really depends on the rider.
I am a bit biased though. there are a metric shit ton of GSXRs out there and not too many RCs. I believe the RC has way more character than any GSXR and would not trade it. The old fat RC is always fun to ride even though it may not be the newest, lightest, fastest bike out there.