Love them, I think they’re one of my favourite Apple Products.
Sound quality is better than the EarPods. Probably not good enough for Audiophiles but I’m happy with them, I’d put them on par with my old Sennheiser CX300IIs.
The fit is very much like the EarPods, and they’re more secure than you would think. The only time I’ve dislodged them was taking off my jumper without removing them, I’ve been running, cycled and shaken my head as hard as I could (for Science) with them in and they stay.
Can’t comment on Siri as I have them set up to play/pause when I tap them but the call quality is good, people have had no issues hearing me when using them outside and were surprised I was hands free.
Battery life is decent, I use them to listen to music/podcasts at work and have only run out of battery once or twice. Once in the case they charge pretty quickly. I charge the case once a week, maybe less.
Pairing is as simple as opening the case next to your phone and tapping the popup. They were then paired to my Mac as well.
Not having a cable is the best thing, not being tethered to my phone is great. I can leave it on the desk if it’s on charge and wander down to the kitchen to make a cuppa without them dropping off. I’m now looking for some bluetooth over the ear ones to replace my cable ones.
Noise cancellation is pretty much non-existent, this doesn’t bother me as I like to know what’s going on around me walking around outside but it might bother some.
The case also picks up lots of dust around the lid/hinge so be prepared to be wiping that a lot.