Turning advantage of TerraMow X
I was looking at the increase in efficiency of a TerraMow shuttle turn over a Luba 1. In a smallish yard, the Luba might turn 100 times at 8 seconds a turn. That's 13 minutes.
In comparison, since the TerraMow has 3 discs instead of 2, it would make roughly 2/3 the turns or 67. The video demo indicates an approximately 4 second shuttle turn for 4.5 minutes.
So you are saving 9 minutes over a small, square lawn. Not very significant.
When the borders are added in, it's hard to say how well a huge mower with turning wheels would do over the Luba 1. Better I would hope.
People with thin, sickly lawns will prefer the turning wheels of the TerraMow over the Luba.