Well I have a 15 and 115 - actually more than one of each. I guess I should have refereed to them as "round bobbin" instead of rotary - and to tell you the truth, I've not looked to make sure my other non-Singer round bobbin machines are full rotary or oscillating as unless I'm fixing them, I don't really care.
I actually have one Free VS machine that is called a "Long bobbin Rotary"
So to clarify, I like early round bobbin machines, whether they are oscillating or full rotary.