[cisco-voip] 2821 / 2851 routers with integrated ethernet blades - anyone using them?

[Robert Kulagowski]

http://www.cisco.com/en/US/customer/products/ps5855/products_data_sheet0900aecd8028d15f.html

These ethernet service modules support 802.3af POE and some other neat 
stuff.  Appear to be better than the older generation, have Stackwise, 
SFPs, etc.

Has anyone deployed them?  Thoughts?  Reasons to _not_ deploy at a site 
which would normally have a 3750-24 or -48?