the old 1st gen smart controller no wont work. the M3 comes with the standard remote the same as the mini 2, air 2, air 2s, mini 3
the DJI RC will work and is $309 but screen is not as bright and missing the extra buttons for customizing
the DJI RC Pro is the better option but cost $1199
Thanks- good answer! I have a Tripltek 8 tablet with a MavMount attachment that will work with the standard controller - so it sounds like I will be ok without upgrading the controller. Thanks again!