I wound up buying a 2017 Salsa Warbird 105 (5800) this Spring. Conveniently Stages was clearancing out their Shimano 105 5800 LH Power Meters. Works great, no complaints.
However, I would like to get it on my road bike as well. I have a 2008 Cervelo RS with Dura-Ace. Unfortunately, Dura-Ace doesn’t extend to the cranks. Has a FSA front crank, and 10 speed cassette in back. Went to my FLBS yesterday, and the mechanic could not figure out a way to get new Shimano on it. The new 105 stuff is all set up for 11 speed, and he thinks there’s a good chance that getting the 105-7000 front crank and a bottom bracket wouldn’t work.
It would be so much better if I could ride both my gravel and road bikes with power, hoping someone has some clever way that I could make it work.