The major difference in the limbs is the length.

And of course, the Katera XL is a "parallel" limb design bow. Which means limbs move very little during and after the shot (due to the preload in the limbs)....this attributes to less hand shock and less vibration.

The XT1000 and XT2000 limbs are longer and therefore, are not used in parallel limb design bows. It takes more to load these limbs. Therefore, they have to movemore during the shot. Sometimes, these bowhave a much different feel than parallel limbbows. Some guys like this feel, others do not. The Seven37, ProElite, UltraElite haveless reflexin riserdesign when compared to the Katera XL. The Katera XL also has a longer riser.

A multitude of advantages are gained from a lack of reflex(ordeflex)in the riser. One quality it sometimes gives up is speed. The Katera XL will shoot the fastest out of the bows you listed.

Back to the limbs. Within construction, there is nothing "different" about the material or process being used to build these limbs. The only difference is found in the limb length.

The ProElite and UltraElite are Hoyt's top target bows. I don't know what you are planning on doing with this bow. The Katera XL would fit the bill for both a hunting and target bow.....as well as the Seven37 would make a great all around bow.

I myself am going back to longer ATA bows. I currently shoot a Trykon and a ProElite. I like the feel of the Trykon after the shot....very dead. But the ProElite holds better and just stacks the arrows. I think I found a happy medium between the two when looking at the specs of the Seven37.

Now I have to get out and try to shoot the new lineup to make my final judgement. I never know until I shoot them. I might end up liking the Katera XL over the rest.

Good luck and congrats on shooting for yourHoyt Shop.