For me, it will be an upgrade to my Le1600.
It will be about 1 lb less, have more ram, a better processor, faster disk, better resolution
Apps? meh... This has applications
3G? I can tether to 4G... or 5G, or even Bieber 6G
Why not Apple/Android: The Surface fits into "my" ecosystem - those others do not
As a laptop... "when working" it will be great.