I think it was worth the cost, it's a good way to get flow to 4 areas of the tank with the same power than if I had a return manifold and have the same flow reduced by 4.
I really think a more flow in short intervals is better than less flow in a continuous fashion (especially if you're working under the recommended ratings for these things, 1000-1300gph, if you chop that up by 4, 250gph really isn't that much flow coming out of a pipe).
The only problem I had was i did not have a stong enough pump to run with it. (Mag 9). From your pump to the OM is 3/4 then the output is 1 and 1/4 opening on the OM so you loose allot of velocity out of the outputs.
I just ordered a conversion kit for mine to turn it into a 2 way.
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