Now I'll be the first to say this mob often have a 'sale', but this is maybe slightly better than others and this is a new model of their mattress. I'm struggling to find what exactly is new about this design as they don't actually point that out. It does have a Tencel cover which the previous model didn't (I have one of these).
You will want to check reviews, though it's a very personal thing. I love mine, but some people can't get used to them. A common issue is some find them too hot. You can combat that to a certain extent with Tencel or bamboo sheets. Most of these memory foam places have a trial period with free return (what do they do with the returned ones?).
Size - Normal price - Sale price
Single $649 $599
Long Single $699 $649
King Single $749 $699
Double $849 $749
Queen $949 $849
King $1299 $1199
Introducing the Ergoflex™ 5G memory foam mattress. A true HD, temperature sensitive, pressure-relieving mattress that moulds itself to the contours of your body. Instant comfort, more support and better sleep.
Free Next-Day Delivery & Returns
30 Night Risk-Free Home Trial
True HD 85kg/m3 Proprietary Foam
Cool-Sleep™ Airflow System
Naturally Anti-Allergenic
Removable & Washable TENCEL® Woven Cover
Established in 2006 with Thousands of 5* Reviews
Interesting to compare the similar Ecosa discussed in this expired deal:
https://www.ozbargain.com.au/node/264004
The Ergoflex seems to have a much thicker memory foam layer (the bit that matters).
It's worth getting the additional mattress protector too as they are Tencel and waterproof. You don't want to spill a cuppa on memory foam.
The pillows are memory foam, medium to low thickness and fairly firm. $150 a pair.
Returned ones are available to purchase. Around half price from memory but doesn't look like they have any at the moment.