Sorry, still no ETA for the Samsung app. We're focused on a lot of Android projects at the moment.
The newer gen sticks are lot better than the 1st gen counterparts.
I've been using the 2nd gen Fire Stick at home and it's doing quite well on a medium recording quality.
That being said, if you want to record at full quality, your network is flaky or you live in a house with wire mesh walls, lots of tile or mirrors, you'll want the box to have the hardwired connection.