I'd recommend the upgrade, too.
In addition to, in my opinion, better stability, there are additional commands.
However, I was not happy with how the method of editing Material definitions changed, specifically the greater difficulty in creating a new Material by modifying an existing one.
TC Pro Platinum 2017, 2016 & 2015 (all with LightWorks) & V21
System: i7-5820K @ 3.30GHz, ASRock X99 Extreme4, 16GB DDR4-2133 RAM, Gigabyte GTX 970, Samsung NVMe SSD 950 (256GB), Windows 7 Pro (64-bit) SP1