A number of folks mentioned that additional tool requirements (e.g., SSIS, SSRS) would be a major factor in their decision.

I understand the rationale and I have applied it myself. However, the new licensing makes these "Free" tools pretty expensive. In both cases the server hosting the tool requires SQL licensing and many folks highly recommend hosting these tools on dedicated servers. Also these tools can be more processor intensive since they are often used to do a lot more data manipulation.

Additionally, if you adopt a strict reading of the CAL then you will probably be driven to Enterprise Edition for at least the SSRS and SQL servers.

So if you find yourself having to license an 8 core SSIS Server, an 8 core SSRS server and a couple of 8 core SQL servers you are looking at a pretty substantial investment.