Never buy a refurb outside Apple’s official site.
The 10.5” iPP itself is a great device. I have one, and I don’t feel it any slower, even with iOS 11. iOS 12 is great, and I can’t wait for iOS 13.
I have brought refurbished iPhone 5S, iPhone 7, iPad Pro from Canada Computers, Factory Direct. All worked fine.
But I admit, it is kind of gamble, because there is no warranty attached to it. But, with Canada Computers, I can buy there store warranty. Still worked out cheaper than Apple.
AND APPLE DOES NOT OFFER REFURBISHED IPHONE IN CANADA!