A friend of mine got one for his OS VZ-B and Ofna 9.5 pro. He said it works OK but for the samne money he said that a starter box is quicker and more reliable. I would tend to think the same when I first started in nitro I had the HPI rotostart system and it worked pretty good but when you are in need of the torque need to break a new mill in the starter box is still the king. IMHO I would say the Tiger Drive would be particularly better for Monster Trucks.
These are just my opinions.