Hey, I currently work at a relatively small Superdrug and have been there for 11 months now.
First off, before I applied I did what you're doing, asking people online, and it couldn't have been more wrong!
I applied (when I was 16) on the Monday, had my interview on Thursday, and by the following Monday I did my first full day, starting on £5.72 per hour.
After 3 months you get your 10% of all products, plus 20% off S/D own products.
After 2 months my pay rose and I am now on £5.99.
My manager is very relaxed and I find I can work extremely flexibly, and it's great.
Training only includes learning the ropes on the tills, and everything else is a "get stuck in" jobbie until you get it. But it's not hard to get the hang of... Filling up, stock, deliveries, etc.
Obviously your enjoyment of the job is largely based on the people you work with, but if you don't get on with someone, just start filling up when they walk past! Otherwise, it is quite relaxed and we're free to chat.
Breaks are also great, as there are enough people working on a Saturday to be able to just go and say "is it ok for me to go on my lunch?" to a supervisor, as and when... At our branch anyway.
Hope I've helped,
Kelly