New Iris graphics on newest MBP 13in 2.4ghz fast enough? Any lag?

Question

So I've been googling my heart out trying to find anyone who has bought the new MBP 13in 2.4ghz (any ram/hdd combo) and reported on this or not, and have yet to find any that didn't say "it SHOULD be totally smooth" (or the like). I bought my first MBA in September, but then found out about the October event, so I returned it in case the new MBP fit what I wanted better (although the battery life was absolutely amazing on the air).
The final decision maker for me between buying another 13in Air, or going for the 13in MBP, is if the new Iris graphics can push the retina display without lag consistently.  I read about the 2012 retina models with the intel 4000 onboard graphics lagging for people due to it not being powerful enough.  I prefer the 13in model because it's size works best for what I need, and both just fit into what I can afford, so the 15in is off the table.
Can anyone who has purchased the based MBP model comment on if the scrolling and general experience is smooth, or if they are experiencing any lag?  This will be my first macbook, and want the best experience I can get (for what I can afford obviously).  If the base MBP isn't strong enough for retina, I have no problem getting the Air with amazing battery life and still good screen quality, but I believe at 9hrs of battery and retina, the new MBP would fit the perfect balance for me of battery vs display quality. 
I went into the apple store yesterday to judge for myself if retina makes enough of a difference to make it a second option (versus just getting the Air), and the retina is beautiful.  I thought the Air's screen looked great until I played on the retina for a bit, the colors look great, and for some reason, I've very anal about the quality of my fonts, and they just looked amazing on the MBP.  The reason I have turned to the community here is that, sure I did some very minor testing, but a little while in the store going through their demos isn't quite the same as someone who has used it for days in real life.  Obviously I can return one if I'm not satisfied and get the other, but who wants to get a computer setup the way they want, only to run into problems and return it a few days later.
If this has been asked already, I apologize and if you could point me to that thread, I would be grateful.

Answer 1

You should also ask this in the MacBook Pro forum. This is the forum for the 13” white and black plastic MacBooks that were discontinued in 2010. You should also post this question there to increase your chances of getting an answer.
https://discussions.apple.com/community/notebooks/macbook_pro