Those who have looked at Boyan Slat's dream with a somewhat jaundiced eye will be very interested in the real-world results.

I wish them all the success in the world.

Cruise ships are the 1st, 2nd & 3rd primary sources of ocean pollution.

Yeah if you think about it he's doing this on a budget so tiny and insignificant compare to yearly government expenditures its astounding. I wish I would of gotten in on the crowdfunding.

The primary source of trash in the oceans is the third world countries that lack to prosperity to afford trash pick-up and disposal services. In Nepal and India for instance, the waterways are considered a goddess and therefore cannot be harmed. Lo, and behold, the monsoon arrive and cleanses the river. Fishing vessels routinely discard oil drums and other trash instead of waiting for shore-side disposal.

So basically a floating oil boom. Low cost simple, elegant.
For narrow/shallow waterways, anchoring will allow optimal positioning with minimal interruption to shipping.
Open sea, set them loose (huge multi-mile long booms) on the oceans with radar reflectors and GPS trackers. Sea anchor to ensure mouth (and cod-end) pointing into prevailing wind. (it's difficult to anchor in a mid-ocean gyrus)
Periodic reorientation and emptying/maintenance, should clear up the oceans in only a few decades).
Where there's a will, there is a naysayer.
Will it work, probably not (entirely) is it cost effective, most probably.
First, get everyone (govt, and public) to stop landfilling and dumping plastic, recycle or incinerate (energy recovery) it.

For those who would have liked to have contributed to the crowdfunding, worry not, because the Ocean Cleanup website has a page where you can donate any amount, selecting from a variety of means (PayPal, credit card, etc.) in either euros or US dollars.
I wish Slat and his team the best possible success in cleaning our filthy oceans. What concerns me, though, is that it might encourage a more lax attitude among the polluters if they know there is a means to remove their rubbish.

I was going to write that this is a really wonderful idea and that I hope it works. We have enough garbage floating in the worlds oceans. But then I read the reply about cruise ships. Is this really true? I have taken a couple of cruises and they were really terrific. Am I helping to pollute by vacationing on a cruise ship? I really hope this isnt true because Im a believer in leaving as small a footprint as possible when I travel. The Best of Luck to this great project, lets clean up the garbage and leave the world a cleaner place!

Len Simpson, if you think they are the primary polluters I suggest you go and check some local rivers and see how much river ends up in the ocean on a daily basis from there...

Len Simpson, do you actually have any evidence backing up your claim that cruise ships are the 1st, 2nd & 3rd primary sources of ocean pollution?
I worked at sea for a number of years on cruise ships for a number of different cruise lines. They all had incredibly strict garbage disposal policies and notices were displayed all around crew areas explaining disposal of anything overboard was forbidden.
Ultimately, the Captain is responsible for anything coming from their vessel and will loose their job if the vessel they are in charge of is caught disposing of items illegally overboard, along with the cruise line receiving heavy fines and a PR backlash. I'm sure in decades gone by that disposing of all sorts of waste overboard was rife but in my experience this no longer occurs in the cruise industry.