I used to be really into Rambos (and had two Duo sets and various others) but since Smartpack blankets now have a 10 year guarantee… I have switched. Rambo doesn’t cover anything but waterproofness, and for only 3 years.
Rambo: " We have such faith in our Aquatrans technology that we are prepared to guarantee that your rug will remain waterproof and breathable for a minimum of 3 year. The unique number of your Rambo® / Rhino ® MUST be included on the form to be eligible for the guarantee. This number is found on the inside of the front of the rug."
Smartpack: " 10-Year Indestructible Guarantee – the fine print:
We are so confident in the toughness and durability of the SmartPak Ultimate High Neck Turnout Sheet that if anything happens to this sheet within 10 years of your purchase, we’ll exchange it for a new one in the same size – no matter what! It’s that easy."
I had a Smartpack fly sheet rip this year and they shipped me a new one right away, no questions asked and they didn’t want the old one back.
Downsides with Rambos too are the fit issues - sizing, and also the lack of adjustability at the front - you can’t cinch down an 81" to fit a 75" horse like other styles.