I peeled-off the Scorchers and threw-on the Comet 1.50s and hit the city streets a second time. Here's the low-down:

As I suspected, the Comets are quicker from 0-15mph. There just isn't as much rolling resistance in this zone as there is with the Scorchers. Stand on the pedals and the tires respond, while the Scorchers seem to just suck the road surface as if they'r running at 60psi. The Comets are "looser" at these speeds, while the Scorchers are "stickier".

Moving out of 15mph and into the higher-end, at 16mph, the Comets are still rolling nicely and picking-up speed. Push them past 17.5mph into 18.5mph, and the tires slowly start to feel heavy at the pedals. At these speeds, the Scorchers feel nice and light at the pedals, and take very little to coax them to 19mph. At 19.5mph, the Comets require more effort to maintain speed than do the Scorchers. The Scorchers seem to open-up at these speeds, while the Comets slowly and gradually start to close shop.

High-speed acceleration from 16.5mph, the Comets weren't as impressive. I couldn't rocket through the same intersections the way that I did on the Scorchers earlier. The Comets would roll steadily and predictably up to speed, with resistance at the pedals increasing proprotionately. The kicker with the Scorchers is that they would blast up to speed without the noticeable increase in resistance at the pedals, leaving plenty of headroom to push them to the limits of your gearing.

How about ride comfort? I ran both tires at 90psi. The Comets were noticeably smoother over bumps.

In conclusion, the Scorchers are a highly specialized tire. It's apparent that they were designed on a dyno to be optimized for a certain speed range. The Comets, on the other hand, feel like they were designed for more real-world performance. I would say that the 1.50 Comets make an ideal city tire, providing a good balance of low-mid speed performance, and comfort (I recommend 90psi). If you're looking for a tire for more suburban terrain, or a tire that is optimized for long, sustained high-speed rides, then the Scorcher is the one for the job.