Is this mattress offer too good to be true?

[Purplekaz08]

Groupon are offering an Imperial 3500 Memory Foam and Pocket Sprung Mattress for £280 reduced from £999.
i am skeptical as usually is something seems too good to be true it usually is. However could really do with a new mattress.
i have googled the mattress and it seems to be made by Happy Beds, has anyone any experience of these mattresses, if so are they worth buying??

[JenLindleyShitMom]

Following. Grouping I think tend to be reliable enough with their offers but it would be the mattress itself I would wonder about. I have no idea if that one is a good quality one.

[Bubbles1986]

www.amazon.co.uk/gp/aw/reviews/B00WOQGRRS/ref=cm_cr_arp_mb_paging_btm_2?ie=UTF8&pageNumber=2&tag=mumsnet&ascsubtag=mnforum-21 reviews seem very good although one does state after 2 months natress was in bad shape. Seems a very good price compared to other places

[Leviticus]

Not sure if this is any help but the DC's bunk beds and mattresses were from Happy Beds and we've been very pleased with the quality.