Shopped in Aldi a few times when I was a student. Some of the produce was a bit crap, had to throw away a couple of spuds out of every bag bought, but generally good value for money. (Note: that means less than average quality but very cheap).
Woolworths is a great shop, very sad to see it's fcuked financially. A few weeks ago Sally needed a car charger for her new Nokia. Carphone Warehouse had a Nokia branded one for £15, Woolies had a generic one for £1.50.
We do our grocery shopping online now at Sainsburys and have it delivered. Do a big shop every 2 weeks, make it over £100 and delivery is free. Infinitely better than dragging ourselves round a supermarket in our precious little spare time.