There are dangers.
When I was first experimenting with this I decided to launch a space probe into the ME system. So, ExtraUtils redstone clock, a chunkloader, and a wireless transmitter. If the receiver still beeps from the other side the probe will be successful.
Hit the button aaand... the world literally deleted itself. The creative testing world stopped existing, forever.
Further testing showed that wireless redstone and chunkloaders and many other things with tile entities fail to make the jump to ME space at all. The clock was what led to the world self-deletion.
Send only blocks and entities. Never send anything complex. If you send yourself into ME space but manage to escape the transparent box using enderpearls, you get a free unique void age that is still accessible via linking book even if the original spatial storage disk is lost or destroyed. Building there is safe. It also snows in ME space, although the complete lack of terrain and sky is inconvenient.
lol.
I see it making a decent jail, delete the persons inventory, teleport them into the pylon area, store it, set their spawnpoint in that dimension, and trash the disk.
tada!
it alternates stuff that's inside. if somethings inside your pylon area, it gets deleted, but comes back when you store the contents again.
I like that it store the state of a furnace and items on the ground as well.
the 16^3 is awesome for packing up a early-midgame house if you dump all the mod blocks into a vanilla chest, possibly using strongboxes to help out.
If you travel with whatever you stored, do you emerge w/ that, or just the blank cube?
I think it would be awesome if two things happened:
1) if you traveled in a 15^3, your box is 15^3, and contains the storage contents. no editing the contents though.
2) if the dimension was fleshed out (as long as the drive is in and the network powered of course) into something resembling the inside of a computer.
and how much power would you need for a full size 128 cube, assuming minimum pylons and max pylons?