I’ve bought the Ear (a) in December 2024, and in February 2025, I bought the SpinFit Omni (SM size). These are my thoughts so far.
They fit really well in the ear! I did a jaw movement test, and when the original ear tip fell out, the SpinFit just loosened a bit. There’s a bit more bass—enough to notice. (I use the treble EQ preset because I’m a fan of a broad and clear sound.)
I’ve used the small original tips, and they weren’t a good fit. The size was almost right, but they constantly fell out, especially when eating.
As for ANC, I honestly think the Ear (a) has peculiar noise cancellation. It’s OK for constant sounds, but anything different can break the silence. I used to have the Redmi Buds 3 Pro, and their ANC was about the same or maybe just a little better.
I can recommend them, but $10 is a little too much.