Our Morrison's is offering these 2/£2.
Now, as a rule, I steer clear of these types of processed food. Well, more of a guideline than a rule. Okay, not really a guideline if I'm being honest...
...but anyway, tried the 1/4 pounder, just to show an open mind for the OP, cocked up by buying processed cheese slices to adorne it (not necessary, a cunningly hidden slice in the bottom of the packet)... It's actually quite nice in a micro-wave burger sort of way. Great for, as others say, convenience grease after a skinful. The sauce is lovely - very McD's, but the whole package is probably better than the McD's experience.
I've also tried the Rib thing - not as impressed, but then I don't care much for BBQ sauce style things anyway.