In the end I would say that there is little difference between the Pulstar and the Brisk, although my bike was so messy until I placed the EJK back that I wouldn't consider it as a veritable testbed. In any case there is obviously no reverting back to Brisk given the latest happening, so I'm happy that there's at least an alternative equal in performance.
Pretty clear indication both Ogre_II and WFerrari machines have early firmware as the added power of spark from the Pulstar capacitive element produces significant differences on all the 650 Rotax designs, it is important to only purchase Pulstar from the official sources though as it would be easy for the cloning mobs to produce a plug which looked like a Pulstar but lacked the capacitor, that is the tightly guarded and patented element in the design
I have had Brisk Plugs in my bike for the past 4000 km, so upon reading this I was a little concerned and pulled them for inspection straight away. My bike is running K&N Air Filter, Dyna-Boost, Big Injector and has the AIT sensor moved to right hand side air intake. I use almost exclusively 100 Octane ethanol free fuel and have no problems with stalling or pinging/lean running. It is a 2012 bike running (as far as I know, the earliest firmware) Although the picture does not show it clearly, the plug tips are a deep chocolate brown colour, indicating to me that the bike is running almost perfect combustion. Also they are in almost perfect condition and show no signs of wear or damage at all. The picture the OP posted showed signs of lean running and possibly detonation that has damaged the plugs, I would be very concerned as to the condition of other engine internals including piston, valves etc. As far as I am concerned the Brisk plugs are still a good improvement and mine have been cleaned and gone back in for another spell.
After running a little longer, my sensations are that the Brisks were slightly better performing at low RPM, while the Pulstars really shine at over 4000rpm. Also, it seems that the Pulstars are getting better with time, much smoother throttle response. In all fairness I was running the AR10ZS, while yours are the AOR10LGS, which are more conservative replacement plugs, but I have to admit that my bike was running really lean during the three weeks without my EJK.
After some further testing I've found that the bike has a tendency to get into some very low idle mode after being idle for a few seconds. Basically the bike stays at around 1500-1550 rpm for 5-6 seconds, and then drop to 1400-1450, running in somewhat more erratic way. The problem is that when I slightly accelerate, the bike would stutter between 2000 and 2500 rpm. Not a big deal, because a quick turn of the throttle would restore the "normal" idle, but quite bothering. Not sure if the EJK has something to do with it, or the Pulstar for that matter, but I purchased the Brisk AOR10LGS to see if there's any difference. (and broke my early promise to not purchase Brisks again.
