I've been using bladders for 4 years now.The only issue with bladder tanks is if you don't empty them, they weep slightly (staining on outside etc) eventually.
The plus sides-being able to submerge them completely without drawing water in,plus the extra space they create-outweigh that by a lot in my opinion.
You'd have to make your mind up as to whether the price is ok, but it won't be particularly slow with 2x40hp 4 strokes. PeterR had a 5.4 with the same engines and his boat was no slouch-I clocked it at past 30 knots.
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