If you're gonna do it...
Personally, I have always found the Sims stuff to work a little better to my ears and hands on my bows. I think the gap is closing. There are some on various boards that seem to prefer the Jax products on their bows. I found the monster jax to work better than the older ones with only 4 "tentacles" per "jack". The Jax are a bit less expensive than Sims, but then again, you already have the Sims. The one thing about split limb bows is you can install/remove the two kinds as often as you like until you either do or don't hear/feel a difference.