EVO Brakes
I initially had a GS with EVO brakes but non servo or ABS. Though they were very powerful unfortunately they didn't stop the prat of a pilot collecting the back of a Merc ("only a fool breaks the two second rule" doesn't work when you've got the weight of a pillion as well!!) The wheels were locked up & tyres flat spotted at time of impact.
Decided the non ABS option had been a bad move as previous 1100GS had ABS, so traded in for ABS model - and got servo brakes to boot. First impressions WHAT HAVE I DONE!! bugger all feel, and brake lever like a light switch, on or off. 7k miles later perfectly happy, braking sensitivity develops (but does take time, or did in my case anyway) & can "feather" brakes no problem to gently lose speed, and if you do need to stop quick WOW can you, although the trade off of lack of feel is still present.
As for linkage,they're the same as the RS, here the front operates the front & back but the back operates the back only, so you can still drag the rear brake in slow speed manouvers - unlike the RT where they're linked in both ways.
On the other note as was said you'll never ride smoothly in slow traffic trying to control your low speed with the front brake, you need to use the back. It's also a lot more forgiving with a bit of rear brake when you hit that patch of diesel / gravel that you didn't see 'cos of all the tin boxes arround you - always more chance of saving a rear wheel slide than a front.
Ride Safe & Have Fun
Ade