How is the Open Water Swim GPS

I was having GPS issues with OWS with my F6.  Prior to the F6 (F5, F3, 910, etc) I had no issues. Something changed marginally with the F6 forcing me to wear the watch on my right hand, etc probably due to minor variations in my Right/Left hand stroke.  Is there anyone that had similar issues with the F6 (not talking about *** strokes, etc) while swimming a relative normal free style that had issues with the F6 that can chime in with how the Epix (or F7) OWS is doing.  I was getting straight line on the course map indicating no GPS signal for lengthy durations.  I will not be OWS for a few more months and hoping that the new GPS chipset and or the mulit-band will resolve this issue.