I was looking at the Xi5 back in the winter and decided after a lot of looking and searching to go with the MK Terrova. I spent about 4 months doing my homework before I made my purchase.
Both the Xi5 and Terrova both had their followers but what pushed me to the Terrova was the remote. The remote on the Terrova had a display window and the Xi5 did not. Since I had no intention of linking my TM to my electronics, having the display window on the remote seemed like a better idea than having no display to check your settings. I guess if you're linking your TM to your electronics you info will display on you screen so it wouldn't matter.

Now I have to say I was a MG fan and used MG TM's since 1979. Switching to MK was not any easy move for me.
So far I have to say I am not disappointed in this Terrova at all and I've since became a huge MK convert.

I thought it would be hard to go from my cable steer to electric but I don't miss the cable steer at all. I did have about a 2 month learning curve to mostly get used to the remote and what the buttons did.

I'm not trying to push MK over MG, I'm just trying to share what info and experience I had to help you make an informed decision.