My worries concern the power consumption of the X3. The amount of weight you have to carry on somewhere in the desert for a twelve hours shoot, I believe more than additional 3 kilos for batteries would bother me.
Thinking of this I decided to buy the tiny Sonosax R4+,which demands for 12 hours only one tiny build in battery (same kind like the X3 ones), I do add an Sonosax SX42 for shoulder work, you can feed the mixer from the recorder and you also have a lot of tracks and best limiting. and... less than 3 kilos on your shoulder.
With the promised software update with delay for all inputs I´ll might be the lucky one and store my X2 in the truck!