I have one. Bought it specifically to increase the life of the stock box and prolong the dreaded death wobble effects of the dodges. I would say hell yes they are worth it, it also seemed to stop my steering wander effects. There are many members running the braces. As to which one is the best, I would say little to no difference. The $120.00 model will work just as great as the $300.00 model. I have the Custom Diesel brace BTW.
Hope my 2 cents helped ya out.
Hope my 2 cents helped ya out.