Before I talk about the sound, even if it's not that important, let me quickly adress that the Talos are well built and comfortable. Unlike the Titan S, which can be slightly too long (a problem you may not have; every ear is different), the Talos sit comfortably in my ears and stay in place even after longer listening sessions.
That being said, let's get to the sound:
The Talos have two sound modes, classic planar and BA+planar. In the regular mode you get a nice, mild V-shaped tuning that is pretty similar to the Moondrop Kato (the difference between the two being that the Kato have slightly more bass, while the Talos have slightly more treble). The bass is present, but on a level where it plays along nicely with the other instruments without getting in the way. The mids are nice and neutral, as they should be. Nothing feels shouty, no instrument sounds overpowering or washed out. The treble is slightly boosted, especially ambient sounds feel more present, while simultaneously some 's' or 't' sounds can be a bit too sharp for some people's tastes.
However, the real strength of the Talos lies in it's BA+planar mode. Quickly activated with the small switch on each side, it introduces a lot to the listening experience.
Most outstanding is the added detail. Quiet background sounds/instruments are much more noticable; in some songs you might even hear sounds you've never heard before. In addition to that, vocals sound a bit more impactful and the soundstage widens ever so slightly, giving the sound just a little more of a 3D feeling. This sadly comes with the downside of having the already boosted treble spike up even more, resulting in fairly sharp percussion which might be a bit too much for people who aren't used to it.
In conclusion:
The Dunu Talos are overall great sounding IEM's. Despite their sharp treble they hold up well in their price class. In the end it just comes down to preference. If treble is no problem for you, go for it. If you're more of a bass enjoyer, you'll probably be better off with the Moondrop Kato or the 7Hz Timeless.
Are they worth their price? Yeah, i'd say yes.