That part is probably true. If you have a good F3, keep it, because there are few of them. They usually worked very hard - a mint one is exceedingly hard to find and will fetch a high price.
Originally Posted by marciofs
The main difference between TLR and other cameras is the height from which you'll be shooting, and how it affects how you interact with your subjects. I'm just over 6' tall, too high for many people subjects (especially children) unless I stoop or kneel. A TLR with WLF is a great help in that regard. So by all means go for it. Square format has its own charm, too.