Ahh, Tiger teeth!
Great for digging anything hard. Main drawback is they wear out fast, but it doesn't matter how long a regular tooth lasts if it wont DIG when you need to.
Like Digger said above, use the twins on the outside only, and the singles in the center. When the outside edge gets worn down, swap sides so you have fresh meat on the edges.
I like these in rock, because the tips will find the narrowest of gaps and break it out.
Once I had a guy digging with a 330 with standard teeth, and he couldn't go any farther digging out a hard bank. The owner was ready to drill and shoot, and even had the holes in already. I said I could dig it with Tiger teeth and got laughed at. Well, 1 set of tiger teeth later the whole thing was dug out to grade with no problem. Owner could not believe the difference, and the cost savings over blasting.