I only play solo, so the siege turtle is not as useful for me as I would like. I would like to see an option for cannon use by the solo player.
I did try it out to get a feel for controlling the siege turtle and found it to be difficult to turn when going full speed much like the roller beetle. I also think that it moves much faster than it should, being that it is supposed to be a turtle. I haven't tried it under water yet. Perhaps I will get to try that out today.