Hate them personally. But I think its what I buy that lends me to this.
If I am not trolley shopping then I am generally picking up stuff that seems to fail in them, anything like DVDs, alcohol, some bakery products, fresh produce etc. All either dont allow you to do it or seem particularly sensitive on being scanned.
A lot of the typical basket shoppers seem to have DVDs etc and are the ones who then hold the whole process up as they cannot proceed.
Agree on the bags thing, annoys me. What I have found is that its worse when there are two of you, you can't have one scan and the other pack as its too fast for the machine, so it keeps warning on weight.
My other half saw someone scan a couple of cheap items and hold onto an expensive one, pay, then drop expensive in bag as she picked up the bag.
I totally agree normal tills are faster than self service, unless there are massive ques at the normal tills.
I still think internet shopping is the way to go. I wouldnt be surprised if at some point you can do internet ship but go and collect your pre done shopping, would also get you to the shop and that way you can impulse buy offers and also pick up items that you forgot to order etc. That I would pay a couple of quid for as it would save me the hastle of the main shopping. I love internet shopping but always seem to forget 1 or 2 items or have 1 or 2 subs that I don't want that means I have to go to the shop and hence a lot of the benefit is destroyed.