I have the B67 on my Novara. It's very comfortable. It sits more upright than the Sirrus Comp. The closest bike I have to the Sirrus is a Cannondale flat bar and I have a Brooks Flyer on that one, also very comfortable but you straddle that one more (your Sirrus would be similar). So the question I have is, how do you like to ride, bent forward or sitting up? Forward try the Flyer first or upright try the B67. Keep in mind, both will require a break in but you should be able to tell if you like them within a week. I've had both the B190 and the B72 on my Townie and the B190 is the pure comfort winner but with the Sirrus, you would be leaning forward and not able to take advantage of its qualities.