Great to keep the ants out.
934232
This cup worked as expected and kept the ants out of the feeder.  Like everyone else has said, you need to stay on top of the water and make sure to keep it filled.  I haven't tried adding a little oil like someone else suggested, but maybe I will in the spring.
2673252
Having moved to a new house, I found that I had a completely different variety of ants that ignored the Borax and Sugar in water mixture that had worked like gangbusters before. Desperate for a solution and having used these outside before, I grabbed a couple packs and placed them everywhere I saw a ant tail inside and out.

Within days the numbers had dwindled, and by the end of the week there were no ants inside or outside the house.

I will have one warning though and that is place them someplace where they will not be kicked or knocked over. If you do the contents may spill out which is a pain to clean up. Where this has happened was in my office and the solution had somewhat dried into a past (I needed a blow dryer to heat it up to make it easy to clean up),

Aside from that, it works magic.
2540835
A year ago we moved from the 9th floor of a highrise complex in DTLA to a house in a quaint neighborhood. Love the extra space, but I forgot what a nightmare it is living on the ground floor with ANTS. When the house was built, the contractor probably didn't seal the house properly because ants seem to find their way into the house through the floors, ceilings, and tiny cracks in the house.

It's been a complete nightmare to deal with because we can't stop them. This clear silicone gel has come in handy because whenever I see an ant trail I'll just seal up the cracks where they are coming from with this, and it seems to do the job! Problem solved. Now I just have random caulking everywhere, but at least it's clear. This works great and dries fast, but the tube is SO HARD TO SQUEEZE. That's why I had to knock a star off. The application is so difficult.
4105001
Worked perfectly. Had ants in my hummingbird food constantly. Put these out and no more ants. Like that it holds significantly more water than other advertised ant motes. Like the style also.
4177405
Great product.  It works very well. I had ants in the sugar water every time I emptied it before I got this.  No more ants from the first time I put it out.  Not only is it attractive, but is very sturdy.  I enjoy looking at it as I watch the hummingbirds.  Beautiful copper color.  Worth the price.
2143117
We had ants coming in our house and put this around in a few spots and they stopped coming in,  Thankfully
300634
If you want something where you can just dump the ants in and never have to open it again until they start dying of old age, well, this is it.  It's got two tiny air holes in the lid, not large enough for regular sized ants or harvester ants to get through, so you don't have to open it to let in fresh air like some other farms.  The gel is translucent and clear enough you can see ants moving through the tunnels on the "back" side (whatever side is not the one you're facing).  The gel acts as food and water for the ants, so you don't need to feed them anything extra.  After I ordered the ants and put them in, I left them alone in a shady spot, and they lived for nearly 6 months before dying, which is a very long lifespan for worker ants.
795134
This worked better than expected.  Being able to squirt it under my hardwood floor edge (it was in the process of being installed and was to be finished another day - the ants were coming out from under the floor and I couldn't find them in the basement or anywhere else.  This did the trick.  I had a bad infestation.  This worked very well, I would recommend this product and I would purchase it again.
2247922
This stuff works great! It is fun to watch the ants go nuts.  A little goes a long way, this one container is probably good for 50+ ant hills.
2866004
This is a good product.  Really works to get rid of carpenter ants and others as well.
3504456
We had an infestation of Crazy Ants. I placed these outside along the wall of my house, 2 on each side of the building. I haven't seen an ant inside in over 4 months.
3669611
Second one we've bought since the first one works so well. Now we don't have to worry about ants getting into either feeder.
3582380
These are super effective for us, especially this time of year where the ants come out in force. We do have to use quite a few traps in order to get rid of the colony but I would recommend these and will plan buy them again.
2983971
Love having hummingbirds visit my feeders but don't like the uninvited ants.  These guards are simple to use and work great.
4868767
Good product to rid home of ant trails.  You just need to find entry and wait several days for it to destroy the queen.
4578011
Looks nice, well constructed, and so far is working as advertised.  No ants in my feeder.  Don't know if it has anything to do with the moat, but it was like 3 days after hanging my feeder from this product that I had 2 females both fly in and sit and feed from the feeder.  Normally they chase each other off all day.  So they are finally starting to share.
961610
A really nice product that works as advertised. I had lots of problems with ants in my hummingbird feeder. It was a constant annoyance. I would remove the feeder and wait for the ants to go away. Then I would put the feeder back up, and instantly the ants were back. Then I looked for a solution and I found the Trap-it. So simple, and a wonderful solution. The ants have stopped and the feeder is just for hummingbirds and not the ants.