According to the Bluesocket Controller (BSC) Setup and Administration Guide, the BSC-2100 provides hardware-based encryption acceleration, however, the BSC-2200 still has double the CPU power and memory of the BSC-2100. The user count is the same as the BSC-2200, each at 400 simultaneous users, however, the BSC-2200 has the ability to aggregate it's gigabit ports in order to better support wireless-N traffic. Further, while the BSC-2100 can run the latest software, the product has not been officially tested on the latest version, either in-house or beta. The BSC-2100 is also no longer supported. Basically the only assistance you would be able to receive for the product would be through the support community.
Wireless-N technology is actually dependent on the access point, not the controller. Wireless-N is supported on BSAP models 1800v2, 1840, and all 1900 series models.