I have both the speedy b 30 and I just got the Pochette Metis. They are very different bags. The speedy is causal, large, and can have the slouchy look. It's great for its size and the way you can carry it several ways for a different look. The Metis is crisp, chic, classy, and earns its price tag due to the design elements, as mentioned above. It also can be carried different ways for a different look, but even worn with a casual outfit, it will still look more chic, IMO. It's much smaller inside, and you will not be able to carry a file, large book, or water bottle inside, like you could with a speedy.
Like Baglady above said, I am enjoying downsizing and carrying only the essentials. When I need to carry more for a specific reason, I can grab my Totally GM or my Speedy B 30 for the day and get the job done in style as well.
Since you have a speedy 35, I'd add the Pochette Metis to your wardrobe. I have loved mine. This bag got under my skin quite a while ago, but I kept buying other bags b/c I was concerned about the size being too small. Since I have actually bought it and carried it, I can say I have no regrets. HTH!