The advantage of the Low Angle Jack is it can be used either left or right handed. For some shooting tasks this is a handy feature. Derek Cohen made a "hot dog" handle for his LAJ. It looks like there are two posts at the top of this page:
http://www.inthewoodshop.com/ShopMadeTools/index.html
Here is one made for a Stanley/Bailey bench plane:
http://www.sawmillcreek.org/showthre...25#post1320425
The dedicated shooter might be a bit awkward for non-shooting board tasks but would likely be a bit better at shooting. The lower effective angle would cut with a little less work and likely leave a slightly smoother finish.
Not having used a dedicated shooter my only comment about the comfort of use is that my LAJ, an LN #62 is a touch awkward even with a hot dog handle on the shooting board. For my needs it is find. If you are going to do a lot of shooting a dedicated plane may be the best choice for doing one job and doing it better.
For other situations where a Low Angle Jack would be useful a Low Angle Block Plane might be the choice.
Over time my LAJ has become my dedicated shooter. It sees occasional use at other tasks.
jtk
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
- Sir Winston Churchill (1874-1965)