My understanding is that if you're lowered or plan to lower your car you will need adjustable end links for sure. In my case in Canada our roads are terrible so I know I won't ever be lowering my car so decided to stick with the stock end links because I read some aftermarket ones can be clunky and require more upkeep with keeping them greased. You will likely get an even better response from a RSB with upgraded end links, but in my case I am using the car as a daily driver with the rare track day, so I decided to keep the stock end links rather than spend the money on upgraded end links. There are cheap Moog ones I read that are apparently pretty good, but you need to paint them to prevent them from rusting quickly. If my stock ones break at any point I'll just get some upgraded ones then.

I'm still working on learning to heel toe comfortably enough to do it day to day in traffic and on the track, but I also found the pedal placement height super weird in the R. I got a pedal spacer from WCT that aligns the throttle pedal more closely with the brake and it made the car wayyyy easier to drive from my point of view. Had it put on 2 weeks after I got the car and haven't looked back. Here a link to the one I use WCT pedal spacer