I have a complete collection of white unibody MacBooks, ie I've got the 2.26GHz Late 2009* and the 2.4GHz Mid 2010. Both are OS X 10.9, 8GB RAM and 250GB SSD, and both of them are incredibly responsive and capable machines given their advanced years.
My only minor gripe would be that the relatively low screen resolution can make Photoshop a little cramped when you've got a few floating palettes going.
I'd have loved it if the new MacBook was an unapologetically plastic homage to the old product line, rather than the 'Airier than Air' offering. Polycarbonate is so much more 'abusable' than aluminium. I suspect that its longevity might well be one of the reasons Apple no longer use it, ie people keep hold of them for too long.
* I got the 2009 on eBay for £180, which in the UK is a bargain. I thought it was even more of a bargain as it was advertised as the 2010 model, but I bought it anyway given the price; that I'd driven half an hour to collect it; that it was mid December and intended as a 'family Christmas present' and I'd already ordered the RAM/SSD/case; and lastly that it was in extremely good condition.