Standing and sitting they are comfortable. Sleeping totally not. To hard on side of head and with the band they kind of twist and dig in when lying on your side.
I have used Shokz for many years and started with aftershokz aeropex for both my runs and work. I have upgraded to the open pro 2s and they are amazing.
The sound is on another level and the mic actually picks up my voice better.
For me, fit is very good - not too tight, not too loose. Does not move while running. Connection to iPhone is quick. Biggest issue is sound qualify. Sound quality is not bad but these just don't compete with AirPods Pro 2 in terms of treble, mid and bass. Plus there is no Siri. Really wanted to like these.