Of course, if you have it, give it, but it's mostly expensive fondant with a teensy bit of pollen.
Unless there's an immediate shortage in the hive, a pollen boost is only useful if you need strong colonies early - for the OSR, or almonds in the US - and if your bees can't gather enough naturally (and I'll bet they can) then best find another apiary.
Murray McGregor (he of 3 or 4,000 colonies) told the story of sending half a ton of pollen substitute to the dump. That must tell us something about its value to bees.