But.....NO I don't actually have experience with the TH version. I only have experience with 5 or so others that are the exact same as the TH, but branded differently. There is no regulation that requires the aftermarket 12v industry to adhere to ANY standard. So.....you see a lot of "me too" stuff for sale. This alarm, I think, is definitely one of those.
If you want an effective alarm, go with a brand that is marketed under the Directed Electronics Inc. umbrella. DEI only sells quality stuff. Their brands are Clifford, Avital, Viper, and one other that I'm forgetting. They are the Industry standard in 12volt alarm technology.
Eat. Sleep. Fish.