Ally PLM is a licensed value added reseller for iMachining for NX. Please contact us for more information and a demonstration www.allyplm.com or 513.984.0480. iMachining for NX is much different than adaptive milling and has major advantages for optimizing your roughing capabilities.
I would imagine you would have to buy it from solidcam and they would tell you how to install and set it up. I would wait for the next Maintance Release of NX11. They will be adding their own version of Adaptive HSM machining sometime around the end of January I believe. It should have all the goodies you'd expect from and Adaptive operation: Bottom Up roughing, constant stepover and tool engagement, etc. I would save the money, be a little patient till they release it and then if you're not happy, invest into Imachining.
Just my 2 cents.
Have a good day.
Just to clarify, NX 11.0.1 will have our initial release of adaptive. It is a great step, but I am sure it will not have all the goodies you may expect in the first release. Remember, we release as we go, as soon as we think functionality is safe and has value to you.