Is this really the better (will not say best for some reason) device to pair with Mavic Pro?
What are majority of people opinions on this?
Any pro's and con's with this unit?

I have the Mini 4 w/ cellular and it works great. Built in anti-reflective coating and its a bit thinner than the older mini models. The only better device I would recommend is something like DJI crystal sky that has a super high brightness. Even the Mini 4 with the reflective coating is still somewhat hard to see in broad daylight but its the best youre gonna get out of the tablets.

Best I've been truing up to now - But in direct sun light it needs a shadow - so i bring an Umbrella  with me in the high mountain where there is no shadow, otherwise i am looking for shadow whenever appropriate (avoid constructions that might block Your signal ;) )

I'm using this as well, great solution. You also have the map and radar displayed simultaneously, because there's more screen space. Would advice to order an 'elbow' lightning cable, short one if you can find it.
Like:      http://ferntech.co.nz/mavic-lightning-cable-for-apple/

I use this cable and it feats very well https://www.amazon.de/gp/aw/d/B01MFBZXFM/ref=ya_aw_oh_bia_dp?ie=UTF8&psc=1