Excellent....but!
I originally tried the Canon 10x30 IS bins, which were wonderfully light but, for me, suffered from a few negative issues. firstly, there was a bit of CA, which showed up, if you looked at a point source of light (and especially stars) and around the edges of objects against a bright sky. Not much, to tell the truth, but it was there, nonetheless. The other annoying issue was that the IS 'on' button had to be held down, all the time that the IS is needed. Close focussing was, unfortunately 4.2 metres. So, not close! They are not waterproofed.
So I sent them back and purchased the 10x42 L's. The CA is negligible. Stars appear as point sources. So that was good. The 'on' button can be clicked on, and stays on, for 5 minutes, or thereabouts, without the need to keep it pressed, unless you leave the bins pointing down, whereby it detects that and turns off the IS. The close focussing is a very acceptable 2.5 metres and they're waterproof. All good stuff!
Any negatives? Size, price and weight! I bought mine used, on eBay but they can cost you £1300, new. If not more! They weigh in at 1110gms, so not the bins for hiking with. They have pitifully useless lens caps, at both ends. Canon should be ashamed of themselves. I bought two UV filters to protect the object lenses and a couple of cheap, Chinese, screw-in lens hoods to reduce flare, which work ok, but the eyepieces, on mine, remain unprotected. All of this adds weight and extra length, though, doesn't it!
Having said all that, I love using mine. There's something almost magical, when the image is so still and Jupiter's four largest moons can be picked out, without the drag of setting up a tripod.
Verified purchase: YesCondition: Pre-owned