How do you mean by customer service David? Their customer service should be the same as anywhere else in the store. eg....you ask them where the bread is and they'll tell you...take you to it. If you're unhappy at the customer service given, it should be the service of the store as a whole and not just the service given on fireworks, suppose it would be useful to have say, one member of staff take a sample of the range home and try it out themselves so they can better inform the customers of the effects.
Suppose what i'm trying to say is if the person working the firework stand at the time is a grouch, the likelihood is they will be a grouch no matter which department they are working on at the time, can hardly expect the great customer service you would get from say, Epic.....nobody in a supermarket would offer you a brew
I think supermarket prices are quite reasonably, especially Netto, their BOGOF selection box at 9.99..i've seen a similar standard box at an all-year retailer for the same price but you only get one. The TNT boxes aren't too bad either, they're a damn sight better than the window dressed Men Shun crap i got at an all-year shop last year too!
Not trying to be biased to supermarkets....even though i work in one at the moment
I try tell people they will get better value at most year-round retailers but to be honest, the closest year-round shop to here is the other side of the city and not very good value, the next option would probably be Epic. If my budget was the same as the average-joe public i would much rather get a selection box or 2 from a supermarket than go on a 2 hour round trip just to spend 40 quid or so on fireworks.