Plants that have been growing underwater don't travel so well in the post but, if you are just moving a plant from one tank to another then they transplant very well, as long as the plant is only out of the water for a short time.
Commercially grown plants that have been grown out of water do travel well, but more often than not, loose the majority of their leaves when submersed underwater.
In a well set up high tech tank, most plants will start showing new leafs before the old ones melt away!