I have been using PD for a long time and I upgrade just about every year. I can say PD has came a long ways and has definitely improved greatly over the years.
But after working with this years upgrade to PD17, I can say the incremental changes should of been a normal patch and not a annual upgrade.
I would say overall not worth it.
I see no Improved Motion Tracking Accuracy after trying many different tracks.
NO significant improvements to the Chroma Key.
Video precut, nested project editing or the best matched profile options....??? I am not sure why anyone would need this.
Where some major work is needed is on the Menu Designer- It has great potential but it has been a mess for some time now.
On a positive note - It was good to see you can now brush mask instead of having to use a star or a pre determined odd shape for masking and a few new features to the title designer is nice.