Hmm... Could've sworn you had an Epson
:-[
OK the difference between a film scanner and an ordinary A4 flatbed one is usually optical resolution.
An ordinary scanner can usually be fitted with a film holder so that it can scan negatives and slides. However up until recently the optical resolution of these scanners wasn't really up to the job.
With the introduction of true optical 2400dpi and even 4800dpi flatbed scanners, you can now buy a multi-purpose scanner that will scan negatives and slides perfectly. However these scanners can be more expensive than some of the cheaper dedicated film scanners.
If you have a lot of film you wish to scan then a film scanner will do the job better than a flatbed scanner. But if you want to scan negatives, slides, photos, magazine articles and do OCR etc. a flatbed is the best choice.