I've had my machine for just under a month. No one with more experience has answered you, so I will. I paid the extra for Netfabb, and have used it. It does slice very fast. AFIK, it does not have 'comb' feature (see below). Currently it does not allow connecting directly to my machine to print - supposed to, but does not work. This is a well known problem. I haven't seen any discussion about printing from NF except that it doesn't work. You have to use another program to upload the gcode to your machine. The NF user interface is more complicated compared to the Skeinpypy & Printrun routines. The high complexity of set-up options (in NF) may offer more function - if you really understand what they all do. The NF learning curve is a bit higher (still a nube on everything here really). The few prints I have made with NF & printrun had really good quality, but have alot of stringing. There is a feature called 'comb' in Skeinforge (part of Skeinpypy) that forces the gcode to make non-printing moves over printed areas - not over voids. This makes the prints come out alot cleaner with much less clean-up time. There is supposed to be a new version of Netfabb released soon. I would think these issues will be addressed.
Knowing what I do now, I would hold off on NF and see what they come up with for their next version. I would learn how to use my machine with open source tools (arguable as good) while shaking it out mechanically. Things are evolving at a quick rate. I could not have known the current state of affairs when I bought my machine & NF at the end of Dec. The price of NF is the same if your buy it with your machine or separately so what is there to lose?
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