They are superb, far better than any other supermarket that we have used.
Absolutely love self-service checkouts!
WHere possible I use the self scan things you carry around with you
probably takes longer overall but the scanner works everytime and when you have finished getting stuff you don;t have to wait around - just pay and leave
Tesco have a system where there is a self-scan only area - but you can also use the normal self scan tills as well - which can be fun when you wander up to a self scan with a full trolley and get lots of "looks"
then finish in a minute or so and leave!
ASDA's one are not as good - work OK but the scanner seems to take a while to find the details - looks like a rubbish network and/or server in the store for them - but they do work
both have staff around all the time to help with authorisations (alcohol etc)#bag checks are normally rare but they seem to have a surge sometimes and you suddenly get a lot ina few weeks
you also get extra if they find you being naughty
I once had a bag check and found I had forgotten to scan 6 bottles of wine
and once I had picked up 6 tins of rice pudding and scanned one 6 times - not realising one was a low fat version - so a different bar code!!
also great for keeping kids under control when they help out
you just have to check for extra things they might have scanned "by accident"
the grand kids have defined jobs in Tesco and take them very seriously!