Touchdro features that Chinese 3 Axis does not have?

[headrc]

I have been educating myself on adding DRO to my hobby machinist Mill/Drill and keep coming back to the question of why TouchDRO over just buying one of the Chinese 3 axis drill kits.  It seems that going the TouchDRO way with using even the cheapest scales comes out to a higher price then the Chinese approach ...and the scales would still be Chinese glass as I understand it.  So are there actual features in the Touch DRO other then the Bluetooth ability that need to be considered?  I would have to buy everything to put together a TouchDRO...including an Android tablet because all of my regular computing is Mac OSX based.  Thanks, Richard