Well, it's a pretty useful technique. As it is a wood technique, it would emerge from the ground from all around the opponent forming a dome and then the spikes will protrude from the earth beneath the now trapped opponent. As the description states, you'll have to send your Moku chakra through the ground towards the opponent's immediate vicinity, beneath them. It would emerge pretty quickly, forming the dome around them, and trapping them within it in complete darkness. Then after clasping your hands together, wooden spikes would emerge from beneath the opponent, skewering them with ease. This would all happen pretty fast as there are no handseals required.
Advantages: There are no handseals, and it's pretty damn useful. It traps the opponent, and immediately after clasping their hands together, wooden spikes would emerge from beneath them, where opponents usually escape when trapped in the cannon technique >.>
Disadvantage: Well, after trapping the opponent within the dome, the opponent could easily escape with a Raiton based jutsu, that also doesn't require handseals, but it will have to be fast enough, timeframe issues <_>