I wouldn't disagree with what you're saying LB, I'd say 90% of the Karrimor beanded stuff I wouldn't touch with a bargepole but if I can see it in the flesh so to speak and it looks servicable then I'll give it a shot. The RRP does look a bit OTT on some of the stuff but in the end it's the selling price that matters.
Kate, I wouldn't have taken it back either (probably) although I suspect that you got unlucky as I'm quite sure Karrimor aren't using a supplier unique to them, the self inflate pillows sold under a variety of brand names all look pretty much the same.
In the end a lot comes down to how a brand is percieved, people had problems with the Thermarest NeoAir leaking, some of the self inflates are prone to delamination, I've had a POE mat that was way heavier than advertised and I'm not the only one, and I read of some cases of them deflating.
Of course when it's a premium brand people are prepared to accept that a few lemons get through and it's a case of "well you can't expect Thermarest or POE to inspect every mat they sell" but if it's a low end brand then it's a major issue if they find a fault and it's like "how dare they not individually check every single item".