A few more data points to consider...
One factor to keep in mind on some of the premium inflatables is noise. Some are loud enough to keep you and your immediate neighbors awake at night, akin to sleeping on a bag of crisps. It can be enough of an issue to make a store tryout worthwhile.
Some of the premium inflatables contain insulation, whether synthetic or down. It is a Real Good Idea to use an inflation bag/carry sack to fill these to avoid moisture from your breath matting and flattening the insulation.
My favorite cycle-touring pad for the areas I go (3-4 season valley/mountain passes/desert) is a 1kg Nemo Tuo Standard self-inflating mattress. A tapered mummy shape, it has a cross-cored top over a solid bottom to prevent heat loss directly down through the pad. There are dual air chambers separated by a plastic membrane so even if you get a puncture in the outer chamber you can sleep through till morning. They're really good for cold weather. I've slept on exposed rock atop two stacked Nemo Tuos comfortably in temps down to -16°C/3°F. When I think temps will be down to about -11, I slide my closed-cell sit-pad under my bum beneath the mattress and this extends the range of the single pad.The bottom 1/3 is blown up stiff and firm to blunt the feel of rocks and pebbles while the top 2/3 is left soft for comfort. They fold in half before rolling so store compactly inside a pannier or can be left flat and rolled 'round a sleeping bag stuff sack to fit in a dry sack with little added bulk. I love mine (ehm, my "five") and the comfort/insulation/sleep quality are so good I don't care about the weight, but learned to my great dismay they have now been discontinued.
I liked it well enough to make the thicker "camp" version my permanent bed at home. Instead of a standards mattress and box springs/mattress, I sleep on one of these atop a 3/4in sheet of plywood on conventional bed rails with a head and footboard; the pad is covered by a thin blanket and the bed is made conventionally. Best home bed I've ever had, going on eight years now. Sadly, this model has been recently discontinued also. Like the lighter model, the camp model is also silent to sleep on.
For my ultralight "summer" pad, I like my Klymit O-Zone pretty well:
https://www.amazon.com/Klymit-Inertia-Ultralight-Sleeping-Pillow/dp/B00GK4LUXQ/ref=sr_1_1?s=sporting-goods&ie=UTF8&qid=1519188188&sr=1-1&keywords=klymit+ozone It is fairly thin, uninsulated, skeleton-shaped and can be used inside my sleeping bag, underneath it, or atop another pad. The idea is the sleeping bag's insulation can herniate up through the holes in the O-Zone mattress and provide some insulation, useful in a down bag where the underside fill is often fully compressed under body weight. I'd say it is useful/warm enough for me down to just above freezing depending on the bag. The attached pillow can be inflated or not or folded over the pad to provide better head support for side-sleepers. It is small. For photos and description here on the Forum, see:
http://thorncyclesforum.co.uk/index.php?topic=11787.msg85865#msg85865It's primary appeal for me are the small packed size and light weight for use in warmer weather. I've sometimes used it inside my sleeping bag over my Nemo Tuo standard with good results in cooler weather. It is most certainly not a cold-weather air mattress.
I'd suggest weighing your requirements to get the best balance between comfort, warmth, and packed bulk/weight to meet your needs. There's no perfect pad or mat, but the one that provides the best night's sleep is worth a little compromise on weight and bulk. Lost sleep is insidious and additive and can quickly suck the fun out of a tour and leave you feeling miserable and under-performing.
All the best,
Dan.