how good/bad is this

[upper]

Compact EF 28-105mm f4-5.6 USM Wide Angle-Telephoto AF Zoom Lens

i got 150$ for a lens right now this is the farthest i found.
for cannon XSI

 

[Dao]

Compact EF 28-105mm f4-5.6 USM Wide Angle-Telephoto AF Zoom Lens

i got 150$ for a lens right now this is the farthest i found.
for cannon XSI

It depends on what you would like to use it for. If you want to use it as a Portrait lens, it will work. But if you are using it for getting a wide view landscape photos, it may not be a good idea on a APS-C camera (smaller sensor camera)

You can go to slrgear.com or photozone.de to read some reviews on lens.