I use a 2010 4/128 every day. No major issues. It's a little slow coming out of sleep sometimes, but for what I use it for it's perfectly fine.
I have been using my 2010 13" air for the last couple of years no problem.
Mine has 4gb of ram and the only reason I am thinking of swapping is I need more space.
But I get a genuine days worth of use out it when browsing etc.
I use ableton live on mine and it runs fine, so garage band will be a breeze.
I am just trying to decide if I really want to sell this for £500 and spend £1250 on a 256gb 2012 Air.
There was someone on ebay selling 256gb ssd blades for £189, should have grabbed one of those and then sold this blade for £99, would have been a cheap upgrade, but I left it and now they are all gone.
What CPU does it have?