OK, so I'll start with saying I have had good experiences with Click and Collect. You sometimes get a better price than just going to the store, and the stock should be in stock.
However the last few times I've used it, the store has not had the stock in store and I've had to travel 30 miles out of my way to collect from another shop. The last time I did it, I was told that the store doesn't reserve the click and collect stock because there was no guarantee that the online customer will turn up, and they could charge more in the store.
In my opinion you can't rely on this if you're in a hurry. You might be able to save a few quid with Comet, but after you've wasted half your day and had to drive back and forth to make the purchase, is it really worth it? I may use this service again if there's a huge saving to be made and I've not got much on that day, but otherwise I'll avoid this like Swine Flu!
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