I've got the PB knockoff version of those (called Boulevard). For what you and I have in mind I like them quite a bit. When I first put them on, replacing a set of flat pedals with toe straps, I found that I had to raise my seat just a smidge to get my fit right again. I normally ride with the cleat side so that's how I set up my seat. When I try to ride with tennis shoes it seems like my seat is just a touch higher than it should be. So there's a bit of a difference in the extent to which your leg will straighten out (due to the thickness of the cleat and mechanism on the pedal). At least that's what I percieve. It modest though and you get used to it quickly. Over all it's worth it to be able to use cleats when training, but also take the bike to the grocery store.