I have both the corded and cordless Carvex saws as well as the Bosch corded saw. I reach for the cordless Carvex 90% of the time. If I use it inside, I use the dust collector attachment. Outside, no dust collection. Dust collection with the attachment and the vac turned up high is about 50%.
I learned to store the battery detached from the saw. It's very easy to grab the saw out of the Systainer and trigger the power switch. I put the battery on just before I am read to cut. When the cutting is over, the battery comes off.
I prefer the blade position on the Bosch to that of the Festool. It seems to be easier to see and, thus, guide.
I had trouble with the Festool blade guides at first getting too tight. After some experimenting, they work fine. My cuts are true 90 degree in up to 2" hardwood. To be honest, I use my Sawstop for the finish cuts, not the jigsaw.
I'm intrigued by the Mafell, but no one in my area carries them and I hate to buy an expensive tool without handling it.