My personal opinion is that while it is a nifty idea, there are a lot of things that are distasteful.  The personal liscense would not be a bad price for maybe $50 to $75, but has way too many restrictions on it. At $99 right now, soon going up to $199 I feel that is too much for a hobby only product, or educational equivalent version.  As for them knowing whether or not you used their software, it may hide tags or signatures in the mesh cleverly (I've known modelers who have done this quite effectively), or it my tag the file properties. I especially do not like the particular terms of their liscensing agreement that gives them the right to collect personal information about the user, hardware configuration, and usage logs (i.e. logs of what you have created and exported, etc...) - this smacks of a program that either has, or will have hidden spyware, and possibly malware in it.  Also with it being governed by the laws of Korea, it gives me reason to take pause, as their laws for copyright and trademark are vastly different than other nations, as I do not believe they were a signing member of the International Copyright Convention (I might be wrong about this - several asian nations are not though).  As for their small business liscense, well, $700 is just nuts for this type of program, IMHO, especially given that is a liscense for a business to use on only 1 machine at a time (if it were a volume liscense maybe it woul dbe worth it).

I feel it's a risk, but if it holds appeal to you, that may tip your descision.  Also, since there do not seem to be a lot of plugins for this type of project, they pretty well have the market cornered, and can charge whatever the traffic will bear (unless someone comes along and writes a competing program).

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