This lens is as sharp as can be, yet a bit lighter than other Leica lenses the same size. Focusing is smooth and precise. The build quality is excellent, despite what other reviews elsewhere may say.
An overall excellent lens!
This RAM fits perfectly (I increased the RAM from 3 to 4GB; replacing a 1GB RAM card with this 2GB card) and worked well for an immediate performance improvement for my old Acer 4736z laptop.