I almost exclusively use my Switch at home, so no need to purchase this for me even if I didn't own it on PS4 already. Good for anyone who plays portables, most impressive port to date. Much better than Panic Button.
Predictions (Made July 2019)
LTD: PS4 - 130m, Switch - 110m, XBO - 52m 2019 : PS4 - 15m, Switch - 18.8m, XBO - 4.8m 2020: Switch - 22m (Peak Year)