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Remove the 150 day restriction for the web edition. make it time unlimited as the ISE WebPack.
This is the main factor for me to use Xilinx instead of Altera. And I am sure that for many more too.
It is prefereable that it does not work for high-end FPGAs, CPLDs or Structured ASICs, and only for low/mid range devices, but works unlimited in time.
JaaC