Those are important points. I just watched the Sesame FAQ video and it says Sesame generates one time passwords, so I'm not sure a key logger will work, but since I do have to type in my master password to open my LastPass account, a key logger will have half the necessary info, but this is a two factor system so it is not a wide open door.
Key Loggers are a concern in the Internet cafes, of course. Most of my friends, where I might log on their computer, are not techy enough to run a key logger, but since they do not live in a vacuum tube, there is always the remote possibility.
At some point it becomes such tail chaser, I feel like rolling myself up in bubble wrap and throwing myself off a cliff into the stormy grey seas!
But I think, I will try it. If possible, a read only, LastPass/Sesame secured thumbdrive with a browser installed so I browse from the thumb drive, not the host computer. Then I will clasp my hands together and beseech the Fates for a good toss of the dice!