Pros
Whatever shift you get, days, nights or twilight its a great team environment. Everyone's really friendly and the work can be flexible. This is great for students and graduates looking to earn some decent money while balancing study, internships or keeping money in your pocket while job hunting. Progression can be very fast too, this will depend store to store, but you can make it to section leader (the first rung up the ladder) in between 1 - 2 years.
Cons
The pay's great for night shift workers but you earn your keep! Its a tough shift and turnover is high, many thinking its an opportunity to sit down at a till in an almost deserted superstore for 8+ hours, reality quickly sets in (its a replen job, getting the shelves full working delivery pushing to clear stock out of the warehouse, its non-stop from the time you start until shift end) and its not for everyone. No slackers! It can be a monotonous job, very process orientated, you will feel like a bit of lacky. Its not glamorous The pay for "normal shift" (days) is a little over the minimum, not bad at all but nothing amazing. I've had the good fortune of having great managers, they're very personable, approachable and empathetic to their team. This will differ from store to store obviously and there are some insufferable managers I've heard though.