UAD is a myth
1 - it offers NOTHING above native soundwise
2 - It has al sonic imprints plugins have in general compared to analog hardware (sound artificial, phased, hollow, plastic etc)
3- On top of that UAD is limited to the amount of instances that can be run on their cards (you pay for an MP plugin and then you need to buy like 4 octo’s if you want to use it like you would use native
4- UAD introduces latency because of the processing turnaroundtime of the PCIe bus, compared to native.
So yes, personally I think UAD is fully obsolete and one would be better of investing in a fast Win8 native platform and buy some native GEMs like Valhalla or if you into ITB compresson VBC