I've had varying experiences with different transports with the DacMagic. On a very old Nak single disc player from a customer, the DacMagic made very little difference when I was expecting substantial difference. A Cambridge Audio 640C V2 was clearly superior to this old Nak player. But when a DacMagic was connected to a Cambridge 640C V2 as a transport, the DacMagic was definitely a notable improvement. So, based on that, a person would think that the DacMagic would blow away the Nak from its analog outs, but for some reason it didn't respond well to the Nak as a transport.
Other people here have had varying levels of improvements depending on the type of transport used. Regardless of what reviewers or others say, I trust my ears first. For me, I have definitely noticed sound quality differences with various transports and the DacMagic.