Solid Advice
That's a good point Blair and always Solid Advice on avoiding new stuff.
In this case, the 4iiii boys got a good reasonable review at
http://www.dcrainmaker.com/2014/09/4iiiis-introduces-precision.html more promising than some that came before.
Robert Chung is going to have specialized demands for the stuff he's doing. I have run several of his Aerolab tests on both my Vendetta and the Silvio to look at configurations and tweaks. The results give me a pretty good idea of the Cdr and Cda for the bikes. However I'm doing those tests with the Stages power meter; and even in it's high sample rate mode (which eats batteries) the data isn't really perfect for Aerolab (that or my course and technique is sub-par). My virtual elevation graphs never line up as well as others I have reviewed. That's why I haven't posted the results; they just are not good enough to trust. After I do some measured roll-downs this spring I should be able to double check the results.
For road training; the key is that you get consistent results from it; the first 2-4 months with a new power meter you are just going to collect raw data anyhow; while you read the books Larry mentioned. After that you measure your threshold and train against it. Yeah you can compare numbers to others for bragging rights but that's not really the point. Larry's pushing out a lot more watts than I am, but we are both using the devices to train and get quicker, the relative numbers, unless we are racing each other don't matter.
In the end goals matter; I got ok results from a PowerCal for a two years. The data is garbage, below 20-30s averages; but for an introduction that wasn't bad $120 at the time and I think $99 now. Considering that, if 4iiii is even remotely good; at $499 that's an really nice stepping stone up the food chain. I think we'll see more and more of these style devices filling the price void, which is a good thing, very few of us will be buying a $2k+ solution.
But again I do think the power trainers are the biggest bang for the buck.
If you aren't trying to go faster via structured training, or doing some sort of bike analysis, then all these devices should simply be avoided.
Oh and some of the fasted guys don't use any of this stuff.