I can categorically say that any flatbed not designed to scan film will be awful unless you are pleased with lo-fidelity results, in which case I would question why spend all the money on the film and development, and why not use a mobile phone instead and take your memory card to Boots to get little 6x4s.
Most Epson scanners of the past 5-6 years are 'good enough', I cannot comment on the V300 but I have a Perfection 4870 which is about 2-3 generations behind (succeeded by the 4490 and then V700, the alternative line is the pro version of the 4870 which basically included some colour targets and Silverfast, succeeded by the 4990 and then V750.)
I can highly recommend the 4870 at least with 120, it's not a dedicated scanner but it's good enough to print large images from its scans (24x24" being excellent.) I cannot comment on its 35mm capabilities but the 4490 which a friend has, turns out excellent scans of Portra and HP5+, and there are in reality few meaningful differences between the 4870 and 4490, as I always scan at no more than 2400dpi.
So you may find a second hand scanner is perfectly decent. The 4870 I have which came complete cost me £70 a year ago and arguably will be just as good as most of the Epson offerings today (with the exception of the V700 and V750 which I am sure are a little more of an improvement.)
Vicky