Two entirely different designs. Persei seems to be analog (not computer) with the switch in series so everything is dead until you press it. A dropout in power doesn't mean anything. It carries on. Nothing to 'boot up'.
Omicron is processor controlled. There's a computer that flashes lights and turns power on and off in response to a key (not strictly a switch) input. Crash the computer and you're in trouble. We're getting crashes and restarts.
The Omicron is closer to the 8 in that respect than Persei, it too is processor controlled. In fact I'd say the new V2 design is closer to the old V2 than anything else THC has?
OF
Actually the 5-click feature is from the ecig world. Joyetech added 5-click on-off to the eGo-T line a while ago, Yes there is a microprocessor, but calling it a computer is a bit over the top.
BTW. The newest version of the Joyetech controller electronics (yes, you can buy the chip/circuit online) has a new mode!
It can both regulate the voltage (as eGo ecigs batteries have historically done) or it can go into "unregulated mode". It is only a small guess, but I'd bet most V2 users would have been happier with the same change to the V2. Check out the eGo-T 18650 mod tube switch at some online ecig place. And do note that the 5-click feature was added to the V1.2 when the manufacturer was switched, so I'd guess that the Chinese ecig maker dictated the switch/electronics assembly - Look around for S'Moore XPower900c sometime.
-NDA