FVDnz said:

In the Clone Wars they seemed to have made the Probe Droids on that a lot more smaller and mobile not to mention the SE droids flying around Mos Eisley being smaller too. I wonder if tying the Saga together, should those Probe Droids in Empire be shrunk down as well? Mind you it would be quite a challenge for Han to shoot the thing if it's smaller and quicker though.

In defense of the large probe droid: That thing can transmit images all the way back to the Fleet, or at least to a Star Destroyer somewhere near by. It's powerful.