I had a cheapy around town bike with the step through before I sold it. I used it exclusively for shopping since it has a front and a large rear basket and not too much of a loss if someone stole it(beside it was given to me). I had it loaded up so heavy that the kick stand buckle on me. It is a great bike when I have to step out of it when loaded. The extra payload weight and the tall rear mounted basket makes it hard for me to get off a regular bike without a step through. So far I have jumped curb and ride over pot hole and it has surprised me how well it held up.
Only negative I've found is not having the extra space like a triangle for things like extra water bottle, pumps and etc... However, that is irrelevant with the basket to hold what I can't mount on the frame