IMO,
Since you have a sledgehammer already (a known good j/b), why would you consider spending another 300.00 or so for a different j/b? Do you really think there is another j/b out there that will make that MUCH of a difference in the level of play you are at?
Are you a pro needing some other edge? Too much money on your hands? or a Gear WHORE? Unless you absolutely need another cue, stick with what ya got man. Seems like 300 bucks could go into another cue/lessons/table or something. Wait 1 year and get it when it gets down around 200.00! You can get Sledgehammers for 179.00 if you look hard enough. Next year there will be another great j/b out, and I am sure the x-breaker will drop in price.
IMO