I was regularly pulling my shoes out of traditional toeclips/straps, and then I changed to SPD's (2 - bolt)........ what a revelation, and I wish I'd done it many years before. In about 12 years I've only pulled a foot off twice IIRC, and that's on the lowest tension setting. A while back there was a guy at our local Lidl store putting his very expensive bike in the area between two sets of doors (foyer?) as he didn't have a lock - he then skated around and just about got his balance (like Bambi

) I thought he'd end up breaking a leg soon. I suggested he could use the MTB type SPD's instead of the 3-bolt type he had, but he was adamant he had to have them because that's what the bike shop said he needed for a racing bike. The 3-bolt type
may be better for ultimate security (I don't know, I haven't tried them), but if the customer is more suited to something else it makes sense to fit it.