No doubt the ergonomics are horrendous. I generally didn't like it the minute I picked it up. When your use to conventional roof bins, that fit the hand like a glove the L is hard to like. But they balance very well and if you can get passed the lousy hand fit and plastic feel, they really grow on you, and the glass is very sweet.
That's what put me off from exploring the Canon IS binocular range. I just don't like the ergonomics from looking at them, on top of what reviews I've read and watched (yes, I've not held them in my hands as yet). The price of a new pair (8x42, 10x42) is outside my budget so I'd want to pick up a used pair if possible. But I dropped them from consideration.
All in all, I think it comes down a lot to intended usage. From what I gather, these are pretty much ideal for use on a boat or other moving vehicle. The primary intention is to see something distant clearly, for necessity of navigation or other imperative versus casual recreational viewing. I can't see using them for astronomy when a tripod mount will do.
One other thing I didn't see or may have missed:
reliability. Because of this very complex mechanism that is powered, how well does it hold up over time? And if something does go wrong, how expensive is it to be repaired by Canon? That's something that has always concerned me about IS technology.