Don't give up on clipless. I'd pedaled thousands of miles on mtn. SPDs before switching to these exact same pedals when I first switched to road shoes for my road bike...I hated them! I could not get out of them on several occasions (I had them on the lowest resistance and lubed the crap outta them in hopes that that would help) and finally said f*ck it. Switched to Look KEO Plus pedals (which are not tension adjustable, but have very low tension) and have not had even a single fall. I was totally not impressed with Shimano pedals. A friend of mine also has the 105s and has issues. Another woman here on TE also had issues unclipping.
The interesting thing was we all purchased them within about a week of one-another, so I wonder if there was a bad batch, or something. DH even clipped one of my shoes onto the pedals while he had my bike on the repair stand and couldn't get over the torque required to release the shoe--it was greater than the force required to release his Keo Classics on the highest tension setting.