I often get questions regarding skewed irons vs. straight iron. My original set of hollows and rounds have a slight skew to them. The skew is slight and might be 5 degrees. When I started making my own planes I made them with straight irons and have not looked back. I do little across the grain and the few times I do I usually just deal with the deficiencies, which my experience tells me is primarily a mouth that clogs and secondarily a less than perfect surface.
I am about to send out a skewed rabbet and thought you might like to see the difference. It's obvious.
Notice that everything is coming out cleanly. The shavings are held together as they are ejected by the structure of the wood. The skewed iron is in contact with a single point of several fibers at any given instant during the cut. (Please forgive the awkward way I'm holding the plane, I wanted to let you see.)
Now on to the straight iron. (Note: I intended to show you a more productive example, but this was just too perfect. Look inside the mouth.)
The shaving has no strength to it since there is no shearing action. At any given time during the cut the iron's edge is in contact with a single fiber across the iron's width and fiber's length. Due to this, the shaving always falls apart and it often happens in the mouth.
So the next question is 'Should I get a skewed rabbet instead of a straight rabbet?' It depends on how you work. Do you do a lot across the grain? I personally won't give up my straight rabbet. Again, I find it much easier to be aggressive with a straight iron and I have much more control...with the grain.
Is your experience different?