Yeah, but I lied. I do that a lot
But seriously - I've switched to using them in the studio for primary triggering of my Elinchrom heads. The Elinchrom skyports we're "OK", but I did get a bit annoyed at how they would fire 100 times in a row, and then miss the next 4 until I turned it off/on again etc. With the Plus II units, when they're triggered, they fire. 100.000000000% of the time. Never had a single non-trigger that I can remember.
On the 1Ds3 I used to use a Plus II, but it looks a little dated - so I thought I'd put a Plus III on the 1Dx, and keep the old setup as a spare (and also a camera that other photographers can use whilst in the studio) (often I can't link their own cameras into the tethering / 40" screen, which is a big disadvantage).
I still use the skyports for adjusting light power. Plus II & III aren't ETTL of course, but we don't use that in the studio anyway.