Depends on length of project and amount of effects, I did a 7 minute video recently with some heavy effects and it took me 2hrs to render from Davinci and 3hrs out of AE, grand total of 5hrs for a 7 minute video. May seem like a lot, but considering I only had to render my timeline in Premiere once and it took all of 40 mins, compared to have to transcode footage on ingest, render my timeline, and then go through post with similar render times with my old workflow. Now that I have worked it out this workflow is much better than my previous one with DSLR's and camcorders.
But it all comes down to you and your work style, much less about this camera fits all, or on the other hand this camera can never shot so and so, as it's up to the situation clients and your skills.
I'd save money on the red rocket and just buy a proper computer, because with one render times are no problem, especially if you know how to efficiently work with your material in post to avoid things that cause render times to jump unnecessarily. For instance my render times would jump drastically in AE for no reason but when I restart my comp they drop back down, most likely an issue I could sort without the restart but.. mah. I also found stacking effects causes a massive jump where if you do multiple passes the times are drastically less. I wonder how many who complain of reds post have worked with it themselves and recently? (on a decent computer)
If you are working with over 50-60 files ( about 3-5mins each) and you need to color grade and transcode them, tell me a faster way.... Average about 30-40mins per clip and you can see the pain it can be. Also RED will have more noise than a C300 as it is not as low light sensitive.