That's a £250 mattress, is non-turnable and it doesn't even say how many springs it contains? . I'd look forward to some uncomfortable nights if I were you.
each to their own I guess - both myself and the missus are happy so far, still well within the 90 day return period. Tried about 15 mattress's from 4 different shops ranging from £100 to £800 and this was the best we tried.
That's all I can do when buying is try various ones, and buy what felt best, price is irrelevant. What else can I do?