Sony PlayStation Portal review: Portal to disappointment - Reviewed

Literally any other handheld will do. Even the more expensive ones.
The PlayStation Portal works fine under extremely specific circumstances

PlayStation Portal review: impressive hardware but is Remote Play itself good enough?

PlayStation Portal Review: A Closer Look at Sony's Gaming Innovation - Gazettely

Sony PlayStation Portal Review: A Handheld PS5 Companion

PlayStation Portal review

Sony PlayStation Portal Review: A Handheld PS5 Companion

Sony PlayStation Portal review: Portal to disappointment - Reviewed

Sony PlayStation Portal goes on sale, already getting scalped - SamMobile

Sony PlayStation Portal is a $200 remote play device coming later this year - news

Sony Says PS Portal Wasn't Designed to Make a Profit

PlayStation Portal review: fine device for a bizarrely narrow audience - Polygon, playstation portal

PlayStation Portal review: streaming handheld cuts corners

Sony PlayStation Portal review: Portal to disappointment - Reviewed

Sony PlayStation Portal review: flawed but fun - The Verge