Thank you, Paultricounty, for your excellent comparative review of the Canon 10x42ISL. It is very much on the money imho.
Some additional user experience comments:
Battery life is easily measured in weeks. The IS turns off when the binocs are let down, so power is only used when actually looking through the glass.
I usually leave the IS off until there is an area of interest, that also helps stretch the battery life.
Agree very much on lithiums, found that the rechargeables could get funny results when depleted.
The focuser is superbly precise, but super slow, 3 and 3/4 turns lock to lock. That's great for peeling through the reeds, not so good for quick focus changes.
The eye cups are fine if one wears glasses, otherwise they can be uncomfortable, fat and hard.
The glass is a piece of electronics, so reliability follows a bathtub curve, with infant mortality in the first year, then a long period of stability ending in random failures after 10-30 years. My first one lasted 10 years before the IS went out and I'm only 5 years on my second.
This is a solid glass, able to take knocks and bumps, as well as the wet. But it is too heavy to carry round the neck, use a bandoleer over the shoulder or a harness.
For older birders with less than perfect vision such as myself, the benefits of IS far outweigh the modest deficits in terms of sharpness and brightness that you found relative to the Swaro, Zeiss and Leica alphas.