You're doing basically what I'm doing, though I think Starbucks coffee is awful unless it's all dolled up with stuff I shouldn't have. I only do bulletproof coffee once in a while, on the weekends, these days. I usually also put in a spoon of coconut oil.
I drank this regularly for a while, and it didn't seem to stall my weight loss, but it was kind of a hassle because the heat from the coffee mucks up the rubber seal on my blender cap. I could probably do better with a different blender, but my room mate loves this one, and having two seems silly.
I do like that it's basically a replacement for heavy cream. I'm a bit lactose intolerant these days, and while butter doesn't give me trouble, cream does.