Used them for years, no more
After rejecting my cash back yesterday, despite having all the evidence (and the mattress) required, I won't be using them again. First the purchase didn't track and then when I chased and provided an order number etc, it's been rejected. I've bought more than 10 mattresses from them for a hotel in the last 12 months alone.
Anyway... very disappointing. Use with extreme caution.