I work for long hours with my laptop and I get tired from sitting at the desk. They had beanbag chairs at a university I went to which looked very comfortable, but if you work with a laptop on it for an hour or longer it becomes uncomfortable.
I am looking to work on my laptop while my back is at a small angle to the floor (less than 90, closer to 45 degrees). If possible I would like to try out the setup at a real store before buying.
The main issues are usually either the neck, back, or if you are lying on the side with your arm supporting on the bed, then the arm gets numb. I am looking for something really comfortable over time.
I know someone with back trouble who does a lot of writing on a laptop while sitting in a rocker-recliner (la-z-boy). She uses a laptop cart something like this, which extends over the chair from the side.
I have a laptop table similar to that over my bed (but I have a desktop, and the monitor is on the table). I use a trackball mouse, so I don’t need any room for it, and I can just have it anywhere, on the bed, or on my lap or anywhere I want. Having said that, I don’t do much typing on that computer. If I had a laptop, I’d want an external keyboard so you wouldn’t need to reach up to the table for typing. You wouldn’t last long having to raise your arms to reach it.
I’ve worked from home for some years now. I got a nice big lap desk and do everything on that; I use a trackball-type mouse so it doesn’t matter that the surface isn’t perfectly horizontal.
Occasionally I’ll set the laptop on top of a nearby stereo stand and work standing; that’s surprisingly tough on the leg muscles (my legs were sore for a day or two when I first tried it.
I had wrist surgery a couple months ago and could not (and still cannot) handle the weight of moving that lapdesk around, so I bought a couple different tables similar to the ones you linked. The first one was all flat, and has a very good height adjustment, but its surface is too high to use on the couch (I couldn’t see the keyboard).
For the ones that have a tilting portion + a horizontal portion (for a mouse), the difficulty is that you have less flexiblity re moving the mouse to one side or the other: I mouse ambidextrously, and in fact was only left-handed for several months due to surgery on my right wrist. Also, I tend to work on the couch with my feet up so I have the table coming over the couch. The combo tilt+flat versions would have limited my seating position because of the mousing issue. If you sit in a chair of any sort, then these would be terrific.
I bought a slightly different one where there’s no “stay flat” bit. Mousing left-handed is an issue still, as the trackball I use is right-handed only (boo, Logitech!!) so I had to watch out for the mouse making a bolt for the floor.
I’ve actually got a long extension cord cable-tied to the vertical part, with other power cables etc. cable tied / Command-hooked to the pole and/or the underside, so moving it around is relatively easy - I just have to unplug the extension cord. It’s not as easy to raise / lower it (gotta remove the laptop before I feel safe doing that) but in general it works pretty well.
The necessary evil of the laptop is the impossibility of having the keyboard at the best height. On my old computer desk, the keyboard was on a pullout shelf below the screen. Now it is too high for touch typing, and I still haven’t fully adjusted.