Great collection of old photos. I think the timing of the edits is fine and the choice of music bang-on.
I'd suggest you hold back on the variety of transitions. Limit them to one or two types.
Gut feeling maybe that different transitions add variety to a slide-show (or any video), but in fact they become a distraction as the viewer starts to wonder more about what the next transition will be rather than muse on the photos themselves.
I'm really glad people take the time to o this sort of thing. I was watching one of these of my old home town the other month. It almost brought a tear to my eye. I agree with Tim on the point of the transitions.
Midnight Blue Productions M.M.Inst.V.