I guess it really depends on what you want from the app. I can use Tasker to set off an alarm based on an SMS event so that feature is not particularly useful to me. The GPS location thing I couldn't get to work on my phone, but in any case if I've lost my phone I have a pretty good idea where I've lost it or a general area to search. I could see the locking remotely being somewhat useful. My phone locks after 15 mins and wipes everything on the phone if someone doesn't enter the correct lock pattern after 20 tries though. I would like a remote wipe via SMS type thing that would nuke everything on the phone. This app doesn't do it though.