I've never used coated strings before so I cannot compare these to the more renowned brands such as Elixirs, but one thing's for sure: these strings sound completely different than your ordinary nickel-plated strings.
Quality-wise the strings are fine, none of them snapped during use, they felt quite normal to play and they did stay rust-free for a long time, as you'd expect.
Now about their sound. The very moment I strung up my guitar and hit the first chord, I was quite shocked, the strings sounded like the oldest and most heavily used nickel plated strings that I've played. Imagine a normal set of strings that was played for months, very dull and lacking any clarity, that's the kind of sound I got with these.
Now, some people might enjoy the sound, I however certainly don't.
For the money it was worth the try though, no big loss. If you're really on a budget, I recommend the standard nickel-plated strings from HB, they're dirt cheap and certainly more usable.