These units seem to be sold under various names - the one I have is called a veho-vfs001. For slides the results are disappointing - it just doesn't seem to capture the dynamic range of the slide. - I reckon it's a software issue as much as anything because if you use the 'video' capture app which comes with the scanner, then it manages this much better. - The driver doesn't have any colour / contrast control at all, so on images where you have a lot of dark or light, it doesn't do a good job of matching what the image should look like. - For some images it works pretty well though it seems to like a thicker / more contrasty negative than you might normally make.
When I bought this I couldn't find any samples anywhere on the web. - Yes, it is very quick. - You insert the negatives, wait around 5-10 seconds for it to set the levels and then push the button - the capture of the image takes 1 second then a couple more to transfer the image to the pc / invert etc. It's easy to scan a whole roll of 26 in under 30 minutes.
My feeling after running a few films through this thing are that it works best where it can establish a black / white points. If the neg doesn't have this then it struggles... Like a cheap digicam I suppose which is all it really is.
Attached images from scanner.
Pic 1. - Zorki1 - HP5+@400/Ilfosol-s
Pic 2. - LC-A - HP5+@??? / Caffenol test (underdeveloped)
Pic 3. - LC-A - Fomapan 200 / Caffenol test. (overdeveloped)