Installed my JB4 today, initially programmed to Map1 (91 octane), took her out for a trial spin, but struggled to notice much of an hp increase at all. I then changed to Map2 (93 octane) and, wow, I immediately and most definitely felt the increase.
My Emira has a GRP High-flow Media (blue) filter, 3rd CAT delete and Miltek valve controller, which interestingly, I believe are the same mods of the V6 test car used in the Burger YouTube video. Also, I've been feeding my Emira 93 octane since the onset.
I'm not installing the OBDII connector because I'm not really in to checking, gathering and crunching performance data rather, I'm content with my own seat-of-the-pants experience, and a good one it is.
As for the risk/reward debate, with all due respect to the more conservative and perhaps wiser of you, for me, the added enjoyment of Map2 is worth the tradeoff in risking broken axles/motor, whateva...