I bought one of the sets you linked to (House of Chess). I'm delighted with it.
Quality and service were, for my order, above expectations. I'd asked for engraving and had used a symbol that didn't survive the web site submission box. I got an email from them asking me to send them a photo of how I wanted the text to look. That email came 8 minutes after submitting my order on a Saturday afternoon. It shipped one week after ordering, and arrived (India to UK) four days after that.
For me the quality is great. You can't expect the world for the price they're asking, but it's nice enough to give me pleasure each time I use it, but not so exquisite that I'm scared to use it.
I tend to use mine as you describe it. It moves around from room to room and is usually on my lap or the arm of the sofa. The magnets are good - you can hold the board upside down and even give it a gentle nudge and the pieces stay in place. But they also lift off or slide quite easily when you move a piece.
Other nice touches are that both the board and the box are felted underneath so you can use it mounted as the lid of the box, or take the board off and use it stand alone.
Bottom line is I'd buy another one again in a heartbeat.
I've been going through old posts looking for leads on a set to be used at home to work through annotated games and positions. While not a travel set per se, this set will be taken from room to room in the house and used in various places -- lounge chair, sofa, bed, desk, whatever. I definitely want a magnetic set, would prefer algebraic notation, and think that a board around 10" may be the best size. I also am thinking that a folding board may not be ideal for lap use although it may work if I put a book or something under it.
This looks like a good option, but I'm concerned about negative comments re quality and customer service:
http://www.houseofchess.com/travel-chess-set-magnetic-flip-up-board-10-inch-with-algebraic-notations-golden-rosewood-maple.html
Both of these sets get enthusiastic reviews, but the boards are folding:
https://thinket.com/collections/chessmate-pocket-travel-chess-sets/products/the-travelmate-basic
https://www.chesshouse.com/collections/travel-chess-sets/products/9-milled-leather-travel-magnetic-chess-set-with-wood-pieces
This one also gets favorable comments, but no AN and the board looks a little cheap:
https://www.chesshouse.com/products/12-magnetic-travel-chess-set-in-rosewood
Anyway, I'd be interested in comments from others who may have compared some of these options or who may have other sets to recommend.