There was a review in Practical Sailor a few months ago.
Also, I posted a good bit here, notes from some of the testing that went into the article, without all of the detail.
Sail Delmarva: The Easy Button
I would argue against "as tight as you can get them." If the clamp leaks
with no clamp, generally there is a problem with the barb or the fitting of the hose. Overtightening can hasten clamp failure, and distorts and can cut the hose. With 2 offset clamps there is not need to be more than firm.