I am with you on that Matt, I still use CPU about 90% of the time. I had been planning on upgrading my 1070 for a long while, and when I sold my older rig, I sold the 1070 with it, so it was time to get a new GPU. I snagged this one off ebay for more than I probably wanted to pay, but wow...I've only done a few tests with it, and it's absurdly fast.
See screenshot from a quick test I did in 9.3 with caustics on and everything. 2 mins and 45 seconds for 5000 samples.
(1080px squared).
Even faster in KS10 Beta.