Anyone thinking of that single leg option would have been better with the 4iiii crank, comparable end price, 4iiii is somewhat proven and you can buy and receive in one week instead of paying $200 and receiving much later in the future. Then you are tied to the ZWatt where you have no additional obligations with the 4iiii.
Seemed over-priced to me.
There are three things about it that interest me.
1. I like the charging system. I don't want to change batteries, even if it's easy, even if it's a common battery. I've mangled enough "coin slot" battery covers that I'll do anything to avoid them. This also means that I'm not throwing out a battery every few weeks, and that suits me environmentally. At this point we charge our phones, watches, cameras, Garmin, and shifting systems, why not our power meters.
2. I like the idea of the system being updated wirelessly via their phone based app. The last power meter that I had (an older power tap hub) was nothing short of world's biggest pain in the ass when it came to updating.
3. At $344 after two years of the monthly fee the Zwatt is still cheaper than either the Stages or the 4iii and you get updates for life.
Like I said in the OP, I just think it's an interesting idea in bringing power based training to people who might not have been able to easily afford it before. I'm eager to hear from folks who get them after the first of the year.