ORIGINAL: 98Redline
Ditto on what Rick says about the spine. They are so incredibly stiff that it would be nearly impossible to keep them long enough and get enough weight in the tip to spine them properly.
The 30X pro is a great indoor arrow, and probably can be used very effectively on the 3D course, however the sidewalls are not very durable. If you happen to be the first guy into the 10 ring you may get a couple of arrows broken due to collapsed sidewalls. Another consideration is performance in the wind. If you are shooting any appreciable distance and have a crosswind, the 30X pros have so much cross sectional area due to the fatter shafts, they will tend to drift more.
They are great arrows, however they were purpose built for linecutting. If that is what you are using them for, then I am sure you will be happy with them. If you expect that you can slap them together shot after shot into a target then you will end up with some very expensive tomato stakes.
Aaaaah, the walls on a 30X pro are VERY thick. There is a lot of carbon in those. I managed almost an entire 3D season last year without a single arrow busted or broken and trust me when I say I put a lot of them in the X ring........lol. These have MUCH thicker walls than say a Pro 22.