Transit Pro = Smaller Scope Pro
The Transit Pro is essentially a slimmed down version of the Scope Pro with a few minor variations (See my review of Smith Scope Pro Goggles). They share the same great features; a flexible frame, proper ventilation, comfortable padding, a stretchy silicone lined strap, and fog resistant double lenses. The obvious differences can be found in the overall lens size (with the Transit Pro being significantly smaller) and the strap width (the Transit Pro strap is approximately 1.5 wide while the Scope Pro strap is about 2 wide).
The Transit Pro Goggle is sized for a small to medium adult face, and is also suitable for some larger youth faces. I got a pair of these for my girl, who found the Scope Pro Goggles to be too large for her forehead and nose. The Transit Pros fit her much more appropriately, while still providing just as much protection from the elements. While they have a slimmer profile, and slightly more feminine styling, they still fit me (with my large head) quite well and dont negatively impact my peripheral vision.
These work seamlessly with the Smith Holt helmet, or any Smith helmet. The Transit Pro is a worthwhile purchase for those with smaller faces, or those who dont like larger/bulkier lens styles. Everything you need from a pair of goggles, except the high price.