Hmm. I know very little about studio gear since all of my portraiture is run & gun. I have 4 flexes and a couple of cranky 580s. The 430s work great and I almost always bring those instead. Still, this was a decision made a bit ago and I probably wouldn't make the same decision again given the high costs.
Your price difference is just for the basic set of two, but each additional Odin receiver is about $130 whereas each additional flex is $100 more than that. If you have 4 flashes, the differences really add up.
5 flexes + AC3 Zone controler (I don't like the mini because of the battery) = $1230
1 Odin trigger + 4 receivers = $850
A 44% difference. Not insignificant. But I'm sure you're right about studio lighting.
Well that 44% difference is a little disingenuous because you are making a $100 difference based upon battery, when in fact, you could even stock up on the small battery (I just picked a pair up off of Amazon for $4.50 including shipping) and never have to chance running out again for only $20.
Likewise, for my situation, I have a mini, 1 flex, and fire 2 Photogenic PL2500DRRs, 1 Photogenic PL1250DR and a 580 EX II. My cost for my PW solution is $430 (I only paid $375 for the Mini and Flex though) and I fire 4 lights, and that would cost me $850 with Phottix???
As well. My Sekonic light meter (L-758R) will trigger the lights, and metering with the Odins is a real pain because of the pre-flash which can't be turned off compared to what I can do, so in a Studio evironment, the Phottix solution can be 200% the cost of mine.
Likewise... What is your total watts and recycle time of your 4 580s versus 2 PL2500DRRs, a PL1250DR and a 580? I think if I wanted the same amount of light from 580s, I would need 10.
I think e-TTL does some great things, I think speedlites are also fantastic, but I also can see in many cases size matters, both ways... Bigger can sometimes be better, and portability is great too. When I start seeing 3 - 4 speedlites being thrown inside an Octabox, that is a $2000 light modifier. That is expensive portability.
How many Odin / Strato units are out there, versus how many PW, PW II, MultiMax, Flex5 and now PWIII. If you needed to borrow a unit? Which could you find more easily. Part of the PW is the number out in the market and the fact that if you have had one for 5 years, it will work with the PW III. You still may have to pick up a couple of units to take full advantage, but when I click my Sekonic, my strobes fire. That is something the Canon system can't do nor the Odins.
Maybe 10 years from now Strobes will be a thing of the past, and everything will be speed lites, only time will tell.