I have the 535's, which are a step up in drivers, and I love them. They aren't reference quality (which I recommend Etymotics for, and you can buy the isolating sleves for them), and are a bit on the warm side. The 425s are fairly similar, but the 535s are a bit clearer in the high-mids.
Any Shure headphones will have better sound quality than Apple, Beats, or Boise at similar price ranges, since they're built for listening, not fashion.
Shure has jumped the shark. I own these and have stopped endorsing them, the sound quality is utterly rubbish compared to some alternative wireless pairs, which might cost a little bit more, but even a punt on some of the cheaper pairs like Airdots et al. would be worth it.
I can recommend the 1more E1001 triple driver for a similar price point but better sound.
For sound quality I have a pair of in-ear B&O but they are falling apart after a couple years which is pretty annoying because the sound quality is really good.
Compared to airpods?
On a side note, I didn't like the AirPods at all, and returned them. The sound quality is worse than the default iPhone corded earbuds, and they were frustrating if you wanted to frequently switch pairings between a phone and computer (like getting an incoming call and the bluetooth pairing takes 10-15 seconds to change over).