GAFE into PLUS!

Google Apps for Education (GAFE) now has Google + available for use, and we are slowly working our way through it.
We partitioned our accounts in the Organization & users tab, subdividing the domain into suborganizations. We chose an arbitrary trial subdivision and assigned our guinea pigs to this division.
Clicking on the subdivision we then clicked Services and enabled the G+ service for this subdivision only.
One question we had was how this would integrate with our existing gmail account G+. It seems that the G+ application is exactly the same for both accounts. The gmail circles are there in the GAFE account and vice versa. You can circle your own other account. But it does get confusing. I purposely have chosen a slightly different photo so that I can identify which G+ account I am using. Does it matter?
It is a bit disconcerting seeing your private gmail G+ posts appearing in your GAFE G+ post area. We have been using "Make the default setting for new posts unrestricted" but we are currently evaluating that. Should we keep the two domains separate? How will that limit us?