Thank you for these submissions - Very cool!
In general, i really like how you've displayed the 3D effects and the perspective view.
#17 really got my attention for the digital-looking design beneath the word 'digital'. i do think that the word 'digital' is a little bit lost, especially compared to #16 and #15. also, some stronger colors could make this one really pop.
Regarding #16 and 15 - very cool as well. i will say my eye keeps getting drawn to the 4 and what looks like an "F" coming out of it which is a little distracting, as is the lower 'lip' on the 3. but overall, i really like the concept here as well.