Yes, they are so good!!!
I've really never had issues with them falling out of my ear. Every other earbud gave me trouble in that department. They're equally good on my sweaty runs as they are on my business video calls when I want to look a bit cooler without my big over-ear Bose headphones.
You're right, it is unfortunate that you can't use the left bud independently. You can just use the right bud though. I know it's not designed that way and it's sort of a work around, but it'll work and you can keep the leff bud charging. You do lose some of the controls when you don't have the left bud to press. Wish they could fix that in a software update but I think it might be a hardware limitation.