Just a warning about Clone Shipper units, the expensive ones. It's real easy to break a clone trying to remove it from these things, the stem will simply snap off the cube. Even when I make sure the root cube is not heavy from being too wet, it happens. If the clone doesn't have a massive tree trunk, look out.
I have asked them to improve this aspect of the design. Some punch out holes in the neoprene insert would allow you to use a pen or your fingers to leverage the insert out of the tube without severing the stem from the root cube.