I highly suggest you do so. We basically have the EvoTuners dream device now. We've been making do with the SAFC, but now we have REAL self-tuning ability without buying some expensive piggyback.
I've already messed around with changing my launch control and rev limiter, but I will leave the custom tuned multiple maps to Al when he comes back to Colorado in 2 weeks. After that, I will begin to tinker with the fuel and timing maps, but right now it's pretty confusing.
I don't know yet. I don't think you can actually CHANGE the max boost levels without modifying the boost hoses and restrictor pills, but you can change the wastegate duty cycle to remove boost taper and such while retaining the stock BCS instead of using an MBC. I probably won't be messing with it, but it's good to know/understand.