Go grab the lens! I've had mine for 18 months and just love it. A little more DOF wide open than a 'cron, but cost, size and weight is great. Negligable VF blockage. Even with the hood fully exended it just touches the lower right corner of the 90mm frame lines.
I wouldn't part with mine.
Edit: Here is a thred from photo.net that has some shots you might find interesting:
Leica and Rangefinders Forum: What's the best choice for a 90 mm-M ?
- Carl