Xbox One (and Scorpio as soon as it launches) and WiiU (as well as too many older consoles to list including handhelds) here, recently sold my second PS4 due to complete lack of use.
I Was super excited about the Switch before launch, right now I'm glad I didn't pre-order though
I knew from the moment I saw it that it was what I wanted. I don't care if it's not as powerful as the PS4/Xbone I have my PC for when I really care about performance. But for just the fun aspect, the Switch has already excelled for me. I will keep the PS4 for the odd exclusive (though the only games I have on it are Destiny and TLoU which came with it) and with Xbox games coming to Windows I no longer need to invest in a One.
The Switch is the only platform doing something different and I love it for that.