Great tool!
It took a few tries to get this adjusted just right but I got it now! Boy the cats are perplexed and staying out of my garden! The only drawback is forgetting it is there and walking into the trap myself!

deer zapper
When this is setup reasonably this seems to do a good job of keeping deer away. The smaller criters really don't care, raccoons are probably smart enough to turn it off if they care and turn it back on after so you won't know. The sensor is wind sensitive so if you set it too high, it will be triggering all the time on windy days. It would be nice if it had a toggle switch to turn it on and off so the setting could be left in one place. Better would be a button to turn it off for 1 hour so you could work in the area and not have to worry about turning it back on.

Works fine, but has a narrow "view"
I bought two of these just over a week ago. At the maximum sensitivity setting it will spray water to you if you walk 30+ feet away, so that is a positive. However, at maxmium sensivity one or the other will go off (every 1/2 hour or so) without any obvious trigger. I will look out at its coverage area in the morning and the ground is slightly damp (which is fine for my purposes, since I'm trying to get grass to sprout). I haven't had it long enough to know the effect on battery life. I'm also suspicious of the effect of cottonwood "fluff" in the air, falling leaves, or rain. I do know that if water from a sprinkler falls within the detection range, the motion detector will go off (at max setting).
I had just tilled and grass seeded an area about 35' by 50' and there are lots of deer which pass through my yard (I've seen 14 at one time). I should have put the motion sprinklers in place a couple days before seeding and raking, as it seems to take a day or two for the deer to start avoiding the seeded area. Because I put the sprinklers in after seeding there are a number of deep hoofprints in the ground, but I don't think there are any new ones lately.
Notice: The detection range (a fan shaped area maybe 90 degrees wide) allows deer to wander up behind or beside the sprinkler, get detected when they enter the detection zone, then bolt when the sprinkler goes off. I suspect a number of the deep hoof prints in my newly seeded area are a result of deer wandering onto the seeded area from behind the sprinkler, then digging in their hoofs when running away after they entered the detection zone. The sprinkler covers 180 degrees or more (like any pulse sprinkler), but the detection zone isn't that wide so you would have to have a number of sprinklers to overlap detection zones to keep deer from "sneaking up" behind a sprinkler.
In any case, I haven't seen any deer anywhere in my yard for the last week, when I usually see at least one a day, so they appear to be avoiding my whole yard entirely now.
Note to Havahart: Since the sprinkler is about 2 feet off the ground so it covers a big area, how about having a setting where you can just water the ground like any other sprinkler, then reset it to "detect mode" after watering.

This is GREAT!!
I installed the repellant to protect my fish pond. It works wonderfully!! No raccoons have had fish dinner at my house since I installed it!!

motion sprayer from china
The product came in assembled wrong. It sprayed all the time. I had to disassemble it and change the valve spring assemble position on the electric valve piston.