I also have a fondness for the little bronze LN #103, since it was the first new plane I had ever purchased. For years I thought it was a #102 since I had meant to purchase one at the time ... but did not read the label correctly (no reading glasses with me at the time!). I thought it planed end grain superbly ... and it was a shock when I eventually discovered it was a #103!
The larger, adjustable mouth block planes are, however, better. The #103 is great for breaking edges, but its coffin shape and narrower body mean that it cannot be used on a shooting board.
I did complete a comparison of the Veritas premium block planes, the LN 60 1/2, and the Veritas LA BP when I reviewed the NX and DX60 ...
http://www.inthewoodshop.com/ToolReview ... Plane.html
Regards from Perth
Derek