Looked at them this morning. They look OK but quite bulky rolled compared with our thermarests. They're about a fifth of the price though, so if you're not pushed for luggage space or back-packing...
It depends how heavy your are. The heavier the person, the more likely they are going to feel the floor under them, especially when lying on their side.
I have one, I used it last night in fact. (I bought it in a previous Lidl camping event.) I think it's great, I'm not a lightweight person and I have disc problems but I always sleep like a log on it, often better than I do at home.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets