I use a Mac client all the time, for almost all of my Twitter use. Without a great Mac client, I’d use Twitter about as often as I use Instagram: in occasional bursts on my phone when I’m bored, but not regularly.
I use Twitter on my iPhone the most, but still a decent amount on my Mac as well. The official clients aren’t terrible, but
ifwhen Twitter kills off third party ones, it will be interesting to see what happens. Twitter has become an invaluable part of my awareness. I don’t use it for communicating with other people as much as I use it to find out what’s going on in the world. I don’t visit news sites, or even ESPN.com as much as I used to because I know that most time sensitive stuff will make it into my Twitter feed. Those of us who have come to rely heavily on the service might not have a choice.