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ISM-VPN-29 for 2901

Cisco offers a ISM-VPN-29 for 2901, but my reseller told me it would be cheaper to buy the bundle (CISCO2901-HSEC+/K9) than only the module and the HSEC license.

. The Cisco 2900 Series Module (ISM-VPN-29) can provide hardware-based IPSec encryption services of 145 and 550 Mbps in the Cisco 2901, 150 and 600 Mbps in the Cisco 2911, 220 and 700 Mbps in the Cisco 2921, and 385 and 900 Mbps in the Cisco 2951 (IPSec IMIX and 1400-byte packets).

Has anyone ever bought and installed a ISM-VPN-29 or VPN-ISM-39 module into a 2900 or 3900 router and does the ISM-module accelerate the IPSec performance as expected?