How good is the ASUS ROG Ally gaming handheld device going to be?

Are these handheld gaming devices still popular? I’m not a gamer…

See https://www.bestbuy.com/site/asus-rog-ally-7-120hz-fhd-1080p-gaming-handheld-amd-ryzen-z1-extreme-processor-512gb-white/6542964.p

My 10 yr old grand son has one and he gets together online with his friends and fights the good fight…doc

Come to think of it, I believe my nephew went through a Nintendo Switch phase a few years ago. I think he’s more of a PC gamer now.