Samnet with the Mac

I use Serotek's System Access Mobile Network and I understand that it can be used on the Mac with Google Chrome, hope I spelled that right. What can and can't you do with Samnet on the Mac, I've heard conflicting comments. Must you use the Mac voices or can you use the voices you bought from Serotek? Thanks. I heard recently that Samnet use is limited, wish you could do more.