Well, for the price asked, one feature won't work, and IMHO when someone is purchasing something, it is for getting all working.
Then there is the new sound effector, nice, but absolutely not essential for me.
Last but not least, the new voronoi fracture feature seems to be good, but I own NitroBlast v2 and honestly I started to learn Houdini.
So for all the bucks (650 $USD which is roughly 830 $CAD) I have to pay, I feel it is better to invest and turn to Houdini Indie version for further FX stuff as well as the whole possibility of controlling everything like I (or my clients) wish and it is for ONLY 199 $USD.
Now based on possible future contracts next year ,and if R20 is as promising as people are saying (or wishing), then I will get back, paying certainly a bit more but at least in the meantime I would have learnt another powerful tool for cheaper.
Don't misunderstand me, I do like very much Cinema 4D and I do respect people ready to roll with R19, but reality of money (cost) caught me back, so I have to invest quiet wisely with my very modest budget.
Cheers
Regis