Mine is 2011 entry level 11"
I use Parallels/W7 on it too
Never felt a need for more ram, it just blazes along waiting on me 100% of time.
I bought a refurb and got tired of waiting for a 8gig unit to show up so got the 4gig
Now glad I saved the $100
My daily driver is an old '09 MBP w/8gig and it is still runs as good or better as the day I got it.
(confession, I did put in SSD)
It stays home for the heavy lifting and the MBA goes with me everywhere.
I use Parallels/W7 on it too
Never felt a need for more ram, it just blazes along waiting on me 100% of time.
I bought a refurb and got tired of waiting for a 8gig unit to show up so got the 4gig
Now glad I saved the $100
My daily driver is an old '09 MBP w/8gig and it is still runs as good or better as the day I got it.
(confession, I did put in SSD)
It stays home for the heavy lifting and the MBA goes with me everywhere.