I posted this in a different thread a few days ago, but I'll add it here too.
I installed the BSH endlinks and 27mm RSB this past Saturday.
Day-to-day driving to and from work and errands and all that boring stuff there isn't a noticeable difference. Unless of course you drive like a douche bag around every possible corner. Then you'll notice the difference. But standard driving, not noticeable change.
However. That really fun on-ramp we all know of? Yeah, definitely noticeable there. There's a good one near my house. I had a friend with me in my car and all I heard from him when I was taking the corner was "oh shit oh shit oh shit oh shit" and then the road straightens out and he keeps going; "oh SHIT THAT WAS FUCKING AWESOME! HOLY SHIT! oh shit, fuck yeah... Oh Shit!".
I could feel the back end wanting to come out, but it didn't. It was in place, behind me but enough to keep the car rotating throughout the whole corner as I kept applying the accelerator more and more till I had to slow down to merge into the highway traffic. My front left tire was the weakspot while doing this, I could feel it rolling (RE-01R's) over a bit and if it wasn't for that I could have kept going and going. Understeer was minimal, back end was shifted just enough to keep it in place allowing me to hold the line. A few bumps in the road and it wanted to step-out but it never did - not to say that it can't or won't. Just that it didn't.
I can't wait to try this out at the next autocross while on my r-comps.
[edit] I think with most drivers you can give them two stock cars exactly the same. Tell them one of them has better parts on it and they'll claim that one is better after driving both. Even though the performance would be the same. Placebo effect.
there's an autocross this weekend and it will be my first 'true' test with the items, then the following week is another bigger, better and faster autocross (at an old airport runway), followed by a normal SCCA autocross. So in the next few weeks I'll get some good testing out of it and can have a better review then.
so far no clunking noises that weren't already there.