I know that SIMS purchased a Stealth Stabilizer recently..........not exactly sure what they are doing with it.
I' m sure that they didn' t care too much for all the posts reporting that they were better than their stuff.
I persoanlly am one of those guys who found the Stealth stabilizers to be superior to the SIMS models. Up until I purchased the Stealth, the best I had used was a combination of a " Tranquilizer and an Enhancer2000...this was my benchmark for almost 2 seasons.
I did a " Blind Shot Test" a while back shooting a bunch of different makes and models, and the Stealth came out best in Noise, recoil, and vibration reduction of all the models I tested which included SIMS, Vibracheck, Doinker, AEP, NAP, X-Ring, Hi-Tek to name a few..........I also continue to head-to-head these stabilzers as I test and purchase new bow set-ups.
" Saggitarius" also did a review of the Stealth a little while ago also, and he also found the Stealth to be the best he' s tried and he like myself likes SIMS products as well, (and he also has a few stabilizers I' ve never tried including Kyber)

IF you can find the right length/weight combo to balance your particular set-up you won' t be dissapointed in a Stealth. Until the day I test one better that' s what I will shoot on any of my hunting bows.
I really can' t help with the balance issue on the Mathews LX....I haven' t held one yet. What might help your decision is to place stabilizers of known weights that you might own into both front and back to come up with a front/back weight ratio that balances your bow properly before you purchase. If you have a shop that will let you play you should have no problem...........either way you won' t have to guess.