It really depends on what you think about the older coarse tooth Snap on ratchets. Personally, I have a few of the 20 and 30 tooth ones and I don't care for them that much. I use my Gearwrench 120XP and other made in Taiwan ratchets far more than I use my old Snap on ratchets. If we are comparing Snap on new vs old, I'll take a dual 80 ratchet any day over the older ratchets.
$55 is kind of pricey. But then again, It's harder to find vintage flex head and screwdriver handle models on the used market than the usual fixed handle ones. I got handed down a beat up and rusted 3/8 dr Snap on F711A flex ratchet that my uncle purchased at the flea market for a few dollars. If you are collecting ratchets and you really want this one in your junk pile, $55 is acceptable. But if your main reason for buying it is for actual use, I'd pass.