Switching to the X-T1

So this is specifically tailored to those who've made a complete switch, particularly from a DSLR to the X-T1. I know many have been doing this switch but, I'd like to know if there are any downsides to this that some many feel. I'm planning to sell all my Nikon gear to make this switch which is quite a commitment and I don't want any regrets.

What do you guys miss from a DSLR?