The voice pack is nice. I like that they're adding more variety (and they added an included/free one at the same time as the first paid one, so you don't have to pay to get Verity out of your skull if you don't want to).
I look forward to a voice pack with the much debated "Imperial" accent. "Sounds like a whine" and "accentuated vowels" could be amusing.
As for competing with HCS... why would that be bad? It's very common for games to look at what the modding/third party community is doing with their game and say: "Huh, that's a really great idea! We should do that in the base game so everyone can enjoy it!"
Imitation is the sincerest form of something or other.