KISS Opinions

[DanL]

Chuck N and Deep Wreck have commented on the KISS.  Anyone else with experience, comments? John J?
Totally new to thinking about rebreathers, so some questions.
- Metering orifice/manual PO2 trim seems fine.  What are some reasons, other than convenience of "autopilot", that SO many choose Inspiration, etc with autopilot?
- How complex is controlling PO2 while descending, ascending as diluent is added, gas is vented?
- Is the manual O2 adjust mechanism really really reliable?  can it be bumped, adjusted inadvertently?  is there a backup other than going OC?
- Training - time, cost?
- Approx cost with KISS, tanks, regs, sensors, other reqd stuff (have plate, wing)
- anybody have a  pre/during/post-use checklist they use that would give a good picture of how the unit is used?
- Would like to focus on merits/discussion of the KISS unit - not others and not pro/con vs OC.
Thanks,
Dan