Having used butler before steamcmd, I cannot believe how clunky steamcmd feels in comparison. I just want to say thank you for incorporating such a lovely deployment tool into the build pipeline! 

- Vicky

Well, I was an alpha tester for a similar tool for "the other" website like this, and I must say that Butler does outrank the tool they got there by far indeed. Especially in alpha/beta periods when a lot of updates can be expected, Butler does a great job.
I've never used steamcmd, since I never released on Steam so far, so I cannot compare that.