Has anyone bought a Premier Inn (Hypnos) bed?

We're thinking of doing the Premier Inn buy a bed thing:

http://www.premierinn.com/en/why/Buy_our_bed.html

because:

1. Prices are decent for Hypnos beds - I've found bottom-of-the-range Hypnos beds at almost comparable prices from shops, but they are thinner mattresses
2. We can go and stay a night at our local Premier Inn and try the mattress properly (as opposed to a ten minute test in a bed shop) (and I mean test sleeping a whole night in it, before anyone comments )

I've contacted them and they've confirmed that the mattress you get is the same as that supplied to Premier Inn (I asked whether they were making a domestic version for the ones they're selling that might feel different).

However, I've googled and I can't find people who have bought them to hear comments! I've found one person on another forum site who ordered in January, waiting to hear if they have any feedback. In particular, it would be good if anyone has had one for a while now and can comment on how it's lasting.

I know people who have had Hypnos beds for ten years and the mattresses are only just starting to dip. We're thinking of going for Hypnos because we're sick of mattresses that sag after 2-3 years (and we're not heavy people). However, I wonder about the longevity of their contract mattresses. Hypnos have confirmed that the Premier Inn model you buy isn't one of their retail range that you'll find in the shops. I would assume hotel mattresses are designed to take some wear, but I don't know how often hotels change their mattresses.