Tried the 11" out for two days, then swapped to the 13" 1.8/2/256.
I've been back to the local Apple store, even today and they have them side by side, it reaffirmed my choice to the 13". To each his own, hope everyone gets the one the want but for those deciding here's a few things i discussed with the Apple employee.
Specific to my work and VPN client I use the "F" keys alot, 11" are tough to deal with imo, 13" is much better and while not exactly full size, good enough to deal with.
As for the general items, side by side the 13" speakers sound more full and a fair bit louder than the 11".
The other obvious factor is screen size, while the 11" has a great looking screen I simply prefer a bit more real estate when working with things like Office, typing proposals, presentations etc..
Looking at a max'd out 11" I was already to 1400+ with tax so wasn't a tough leap to add $300 for the base 256ss sized 13".
Bottom line I don't think the 11" was a regret for me, as much as just not the right fit, if I did not need to use the F keys daily I may have stuck it out a while to see how things went.
They are both very capable work machines and even at the Apple store we loaded up basically every program on the machines, streamed a 1080p video from the Apple HD Gallery site and both performed flawless. I have to admit you simply don't expect a machine with the baseline 11" spec's to do so well.
Anyhow good luck to everyone trying to decide, it took me 6 days to figure it out but I know the 13" is the one for me, now it's a matter of do I go for the Max'd out or not haha...