Originally Posted by moxfyre
I had those [Shimano A520], and they are NOT convenient to ride on the other side, which is not at all flat. The much better choice is the combo clipless/platform pedals I've been discussing

Thank you all for your comments, I'd like to give back to the community.
I got the Shimano A520, and used them twice already on my commute (about 4.20 Km each way) with running shoes.
The SPD side is like a regular SPD pedal, the cage is below the SPD thing, so it can't be used.
The other side of the pedal isn't flat at all.
It has a ridge where the bearing is, which isn't convenient at all.
I ended riding the SPD side.
I guess I'll look for some SPD shoes that look ok for work.
I don't want to carry 2 pairs of shoes.
Tal.