First of all, whenever you read a review saying that it's too slow to capture an image, it's simply because their PC only has old (slow) USB 1.0 ports. If your PC is modern (e.g. approx 3 years old or less) then it will have USB2.0, and it will transfer images VERY quickly and easily. => Do not worry about this!
When I got this, I installed the latest driver (from the veho-uk website) and then scanned in about 3 or 4 negative films. The results were not amazing, but they are perfectly acceptable for my needs. For the money, I was perfectly happy with the results from 35mm *negatives*.
However, then I tried scanning in some 35mm Kodak *slides*, from the mid-1960's. Bright and sunny slides looked perfectly OK. However, anything other than a bright and sunny day looked too dark. My experience in using 'gamma correction' in Paintshop Pro ;-) fixed some of these pictures, but quite a few others were too dark to be used :-(
I then spent WEEKS AND WEEKS going through Google to try to find the solution. Among the various suggestions that I tried, were (a) downgrade to the original driver on the cdrom (b) search the Windows registry for a 'contrast' or 'brightness' setting that I could manually change (c) try 3 different host PCs (d) re-calibrate many many times etc. etc.
Interestingly, I also found that this unit seems to be exactly the same (rebadged) as the Vupoint FS-C1-VP. So I even tried their driver (from their website), which works OK but no better/worse than the Veho one.
On a complete whim I unplugged my Veho VFS-001 from my PC's front USB 2.0 plug... and instead plugged it into a cheap (£10) 4 port USB 2.0 hub (also in my same PC), which also had 2 other devices plugged in.
=> Hey presto! It now works OK! Sure, I have to wait a few seconds (approx 5) to wait for the image contrast to appear correctly (otherwise the whites are too white, or the blacks are too black) but it generally works OK for my needs! Hurray!
[I can only guess that the power from my PC's front USB port was either too powerful or not enough power... and somehow this caused the problem???)
It's still not perfect - as one user says, you will find that this 'raw' image is a bit contrasty. I also agree with another user, if you do not click the 'take picture' button at the correct time, then the resulting picture will be too white or too black (he says "if there is a part of the image which contains completely white pixels, then there is no contrast left. I tried to get around this problem by clicking the capture button before the scanner had auto-adjusted the contrast, which was fiddly but partially effective...").
Overall, I now agree with this other user: "If you have slides with very pale faces or lots of white you may have a lot or burned out slides, but otherwise I was happy with the general quality, colours and definition."
It has been a bit painful to get it working OK for me, but now that it does I'm quite happy.
If you are a 'newbie' then you might prefer to go for a different device (or gamble that your PC's USB 2.0 port likes the device!). If you are experienced, and don't mind a gamble, then it's quite a nice solution for a very cheap price.
=> I'm happy, best of luck to everyone else!