Ultrasonic Gopher control

I've been searching around for gopher control ideas that I haven't tried yet, and was wondering if anyone had any experience with those solar-powered ultrasonic spikes that emit an irritating sound underground? I found a thread discussing the battery powered ones (didn't work for this person), but it was an old thread and I am wondering if these have improved at all. The reviews on Amazon seem to be good, at least for some brands.

If not, I may just buy them and write up my experience here.

I've tried them with no luck. The techniques that worked best for me are putting gopher wire in the bottom of my beds and pouring down into their holes a mix of water, castor oil, garlic and chile peppers.

Stacy Witscher wrote:I've tried them with no luck. The techniques that worked best for me are putting gopher wire in the bottom of my beds and pouring down into their holes a mix of water, castor oil, garlic and chile peppers.

Thank you. Do you remember which brand you tried and what type of soil you have?
I have not had luck with castor oil (but haven't tried the mixture you recommended), and gopher wire is not an option. I am debating on renting a trench digger and burying gopher wire 2' deep, but I really don't want to!

Sorry I'm not remembering the brand.

I have a small backyard so the gopher wire worked for me, and I'm planning on laying down on my next garden, first.

To make the castor oil mixture, I would fill a large pot with water, add a head or two of garlic, broken up, 4-6 chiles. Bring to boil, allow to cool, add castor oil whisking to blend, and pour down holes every morning.

Our natural soil is claylike, but I've been here mulching and building the soil for 19 years.