The Split Pad Pro was discussed in the Monster Hunter thread (and maybe here as well). If you play a large amount/exclusively in handheld mode you’re doing yourself a disservice if you don’t own one. One downside is that they don’t have HD Rumble and a handful of other features you probably don’t care about (NFC, IR, gyro).
Such a huge improvement over the joycons for Mario 64. Haven’t got to the other games in the collection yet.