well since that original post that zensteve just listed I did end up getting a tiger carom cue with the LD shaft. the deflection is definitely lower though it's not really night and day compared to a regular shaft. it plays really nice overall. that so far is the only LD shaft i've ever used for carom.
i'm really interested in testing predator's technology. i'm betting predator's deflection reduction will be something really noticeable compared to a regular shaft. the hollow bore is hard to compete against, nothing is lighter than air. i've played a lot with tiger's LD pool shafts and their carom shafts use a similar design. the tiger design is only moderately effective in reducing deflection. they core the front end with balsa which is good, but they way they do the tenon and ferrule adds back a lot of weight, which is the main thing preventing them from reducing deflection further IMO. the predator bore and ferrule design is much lighter overall. feel....well that's subjective, but definitely way different there. tiger is much more solid, though the predator feel improved a lot when they switch ferrule material to maxlite IMO.
overall though, i feel that deflection with carom cues is generally less than pool already, so the benefits may not be as great, but could still be significant. i think many people may warm up to it over time. i have noticed the biggest difference on long shots, it makes it a bit easier. anyways, it's nice to see the industry evolving, and it's always nice to have more options.