Yes, it does work. The page reports its accuracy within 2.26 miles. Measuring on Google Earth, it was off by 0.42 miles, so well within its stated accuracy on the result.
It did require me to respond "YES" to an SMS before the website provided the detail. SMS text was:
LocationSmart: Reply YES or YES LS to confirm consent for cloud location & messaging demo. Reply HELP for help, Reply STOP to cancel. Msg&Data Rates may apply.
Other responses indicate that the recipient/target has to opt into their location being shown via an SMS, so I fail to understand the outrage assuming the same requirement exists for the non-trial version.
You think consent is being asked for on the non-trial version? This is the service LEOs use to track down fugitives dumb enough to carry their phone. They aren't going to ask for any consent.
It did require me to respond "YES" to an SMS before the website provided the detail. SMS text was:
LocationSmart: Reply YES or YES LS to confirm consent for cloud location & messaging demo. Reply HELP for help, Reply STOP to cancel. Msg&Data Rates may apply.