This is for folks that want the nostalgia of putting a cartridge into a machine and playing some fave games on a modern television. Some folks don't want to doink around with emulators or hunting down ROMs. If Atari is going to start selling actual cartridges en masse, the 2600+ is a good avenue for nostalgic gamers to take. It's a pretty slick looking machine that has more "sex appeal" than the Retron 77.
Personally, I use a Harmony cart so I don't have to yank out my cartridges, so this device wouldn't work for me (unless it's hackable). The controllers, however, are on my radar. I'm not a fan of the Ranger stick from Hyperkin and paddles are becoming harder to find in good shape. I tried playing some H.E.R.O. this past weekend and pushing up didn't seem to register all that well on a Ranger that was hardly used. I'm tempted to roll the dice and get a joystick and set of paddles this payday, hoping they are like the originals in play.