I’ve used them for several years. Aldi collection times are too late for me, I usually stick to Morrison’s. Spar have been good, Nisa hit and miss, Co-Op the worst ( all yellow stickered stale bread that would have been cheaper off the shelf at the reduced prices). My daughter likes the Costa bags of cakes and pastries.
Morrison’s often have nothing left but I usually get an email and refund before I set off, only a couple of times have I got to the store to find there’s no collection, but I shop there anyway so it’s not a wasted journey. It used to be a good big box of food but lately it’s just a carrier bag. They can be naughty bulking the £10 worth of food out with eg multiple bags of slimy cut parsley or coriander (which I do not consider food!), or loads of already inedible broccoli or soft fruit. I inspect the contents before leaving the store and if it’s obviously only good for the compost bin they’ll always replace it. My favourites have lots of decent fruit, expensive to buy and I can freeze if I get eg 2kg of blueberries!
I always donate a good proportion of it to our village food bank too.