Two theoretical strikes against it:
1- if you place it in the line BEFORE your other water blocks, its own efficiency will be increased as heat travels from higher to lower - so in this configuration it will remove more heat from its surroundings. But it will reduce the effectiveness of the downstream heat blocks for the same reason - the heat differential between the fluid and the device being cooled by the heat block will be lower so the efficiency of the heat block will be lower.
2- Now if you place it in line AFTER your other heat blocks, then its own efficiency is decreased on the same logic.
A solution would be to insert a radiator between each device to dump the acquired heat - or put each on separate fluid circuits. But of course, that opens yet more cans of worms re. cost, multiple connections and volume of fluid required... My judgement - NOT WORTH THE MONEY.
.bh.
