The sooner you can get your hands on one the better, I'd say. I'm loving the EmuMovies scanning and LB is working great. However, I'm tearing my hair out with all the "halfway there" PC streaming apps for the Shield.
Gamestream - Unless all your games are Steam purchases it's useless.
Remotr - Opens Big Box, some jankiness and artifacting navigating BB, had to map B & A buttons to Esc and Enter on a custom controller mapping to go through menus in BB, MANY problems opening games from BB to Retroarch
Kiniconsole - doesn't seem to communicate Nvidia Shield controller input to BB
Kainy - constant version mismatch, unable to even connect to PC
Moonlight - formerly Limelight, requires GEForce Experience which is a tragic mess of undetected games haphazardly linked to Steam, which I uninstalled
Splashtop THD - doesn't pick up Nvidia Controller, and gives me a cute little tip about swiping the screen to go into game mode, no matter how many times i rubbed my tv screen it didn't work (i didn't actually but you get my drift)
As long as the navigation and game loading part of LB can play nice with a game streaming app, that would be all we need.
All that being said, if anybody knows a proven way to stream LB and games from PC to PC that includes controller support, let me know. I thought I would replace my HP Mini Stream with this source of nightmares they call the Nvidia Shield, but this is definitely not seeming to be the case.