For a few years there bows were really changing fast. Speeds kept increasing, new cams were coming out, they were getting smoother and more vibration free, yet retaining speed. But now things have sort of slowed down. If there is much of a difference between what you have and a simular newer bow it will not be that big, especially in the same company.

Now if you had a 5-10 year old bow and wanted to upgrade I would be inclined to say you would be able to tell the difference in a newer one. Really depends on the model and type of bow though. They don't all shoot the same, even the new ones. I have shot two models of Mathews back to back and they were totally different.

My best advice is to just go try some and see what you think. If you pick one up and it feels and shoots much nicer than the one you have and it's important to you then do it if you want. However the one you have is more than capable of killing deer and being shock free and silent. If your not happy with the way your current bow feels when you shoot it I would try some limb savers, a different stabilizer and some better string silencers. This would be much cheaper than a new bow. I even put the NV system on my bowtech. The technology is out there to tame any bow down if you try hard enough.

Good luck,
Paul