I've got an el cheapo
Kings "Big Daddy Delux" swag. I really like it. It's not as well built as something like a Darche, but it suits my needs just fine.
Here's a pic of it (the middle one) from a fishing trip last year:
We live in the far-north of Aus, so the ability to roll the sides up and have it all mesh like that is perfect for the warmer months. As you see, with the ridge-pole it free-stands without the need for any pegs which I also like. Later that night (just after midnight) we had a surprise downpour that soaked us - I got a little wet by the time I'd woken up, realised what was going on and rolled down the sides, but otherwise stayed perfectly dry for the rest of the night. Not sure I'd trust it in proper monsoon conditions without it pegged out (particularly having the sides tensioned), but so far so good.
The mattress in it is a 75mm foam one. They do a 100mm mattress as an option, as well as a self-inflating mat. My back and neck aren't too good, so I suffer pretty bad with ordinary mattresses. Happy to report I've never had an issue with this one though - it's quite comfy. I think the self-inflating mat would be even better, but the funds didn't stretch that far at the time.
The light-green Dune swag in the foreground is a more traditional 3-pole dome design. You can see it's got much less mesh and needs to be pegged out (or, in this case, tied to the trailer). It's a much simplier swag though, and works just as well.
Personally, I don't like traditional, flat swags. They're certainly the quickest to set up and the simpliest way to roll out your bed, but I'd get eaten alive by mozzies. I'm also not a fan of critters slithering/crawling in to sleep with me, so I prefer the "safety" of a thin piece of fine mesh

.
The downside to mine, being a double swag, is that it rolls up huge. You can sorta make it out in this photo:
That's it on top of the rack, in the centre. It's the length of the bed (which isn't saying much, since the ute is a short-bed model), and you can see the height compared to the jerries and 4kg gas bottle. Still, it manages to be smaller than my canvas touring tent + bedding, while also being significantly faster to set up/pack up.
This is the only other photo I've got of it packed up on the car from that trip:
Good luck!
Cheers,
Matt