The models look real good, mate, but I feel like the usb stick can be optimized better. Looks like there's too many polys in that blue part. You only need the verts in the loop or tail of the model. The model would be fine in most render engines, but I bet you can get that thing down to less than 1000 faces without hurting the look of it much. One thing I like how you included all the individual parts. That will make it useful in some motion gfx work.