Quoted from insx:
RFMs often have a lot of non-working switches. It's not a huge problem as they can be replaced with a bit of screwing and soldering but it is extra expense and effort that might not be welcome for the newbie.
My RFM has nasty scratches on the glass which is annoying but you don't actually notice it much while playing.
Mine too's got some scratches, do not notice them when I play, far worse are scratches on the mirror blades. I always tried to find someone that could sell even a non original pinball 2k glass but there's no way to find one.