I bought the Loc8tor to try and keep tabs on the whereabouts of my new kitten.
I am pretty impressed with this purchase and it seems to perform the task of 'feline location' quite well. The tags are about the right size and my little kitten doesn't seem to mind it on his collar. I haven't had to use the locating capability in earnest but, after testing, my feeling is that one needs to use the on-screen visuals in conjunction with the audible beeping in order to minimise the time it takes to locate whatever it is you have a tag attached to.
Each tag can be named on the location unit (e.g. cat, keys, car keys etc) which is handy. When you initialize a search, the unit sends out a signal to the tag which makes it flash an LED and beep. This makes cat-location at night easier.
I have knocked off a couple of stars on my rating because the location unit is rather plasticy. Also, I think the price is on the high side.