Bob Atkins of Photo.net has published a review of the Tamron 55-200/4-5.6 Di II LD macro lens.

For photographers who bought their digital SLR camera in a kit with a standard zoom lens but are dissatisfied with the telephoto capability of the standard lens, the new AF 55-200 mm F/4-5.6 Di II LD MACRO offers in a second lens a desirable telephoto range at an affordable price. This new Tamron tele-zoom lens is designed exclusively for digital SLR cameras with smaller-size image sensors.

Bob said-

Optically, at 55mm the lens is certainly better than the Canon EF-S 18-55/3.5-5.6 (which is where the EF-S lens is weakest). Both center and corner sharpness are good, especially if you stop down to at least f5.6. At 100mm center sharpness is good, but corners are soft wide open and don’t fully sharpen up until the lens is stopped down to f8. At 200mm center sharpness is again good and the corners somewhat softer. Some chromatic aberration (CA) is visible at longer focal lengths but it’s pretty well controlled (the Tamron AF 55-200mm Di II LD Macro does use one LD element to better control CA).

Overall the Tamron AF 55-200mm Di II LD Macro makes a reasonable companion to an 18-55. It’s optically decent, if not outstanding, especially when stopped down to f5.6. It would be expected to give good 4×6 and 5×7 prints, but at 8×10 and up, especially in the corners wide open, it’s not going to be as good as a more expensive lens.