Consumer Reports rates the Microgem as Best in image quality, and the Digital Stream as Better (which is not as good as Best). The Digital Stream has a better program guide and comes with a universal remote though.
The blog that reviews these things says without substantiation that the Microgem has reliability problems, possibly due to heat. They don't have much to say about the Digital Stream.
I picked up one of each of these two to hedge my bets against the possible unreliability of the Microgem.
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