Okay with some of the last releases from certified device vendors there is no excuse for not buying certified devices.
And one of the reasons for not going on OCS with Voice (price on new device) is significant lower now than it was , and I think it might be even lower in 2010.
Find all certified devices here
Example on price:
Plantronics .Audio 615M http://www.voipsupply.com/plantronics-audio-615m-headset $37.70
And remember you can still give the “I need my old phone user” this “IPT look a like” usb phone and still get all the OCS features: http://www.polycom.com/products/voice/desktop_solutions/microsoft_optimized_devices/communicator_cx300.html
And while we wait for OCS wave 14 (the real replacement of the PBX/IPT) have a look at Voipnorm opinion on UC devices here