Dalokohs Bar - heavy eats it as your team's ubering into last uber v uber, heavy comes into last on tail end of uber, extra 50 hp medic doesn't have to heal (in case the heavy loses his crit heals, helps ensure he gets to 450) the 50 hp buff basically allows for a bit more room for error in uber/heal management when you're pushing last with a heavy. not really useful holding last or anything since the medic will keep you buffed constantly.
Shahanshah - might be useful for when a scout is on you, if you're hurt you'll deal 81 rather than 65 with the normal kukri or 33 + 48 bleed with the tribalman's shiv
snoopy's been using the dalokohs bar in scrims and it seems ok. I think it's made a difference like once but it seems more useful than the stock shotgun.