It will boost, but when OEM price of the mistking is $100, and this whole thing is sold at profit for $50, you have to wonder. I think its a true booster pump (aka when line pressure isnt enought to push water through a reverse osmosis tank) and will not boost to the full psi of a mistking or other highly rated pump.
Now what you could do is buy a used booster pump from an old reverse, and then just buy the $10-20 in fittings/hoses/nozzles. thats what i did when my pump fell into the bucket and killed itself. "Aquatec" is the gold standard, so if you can find a broke reverse system with a good pump...