Had Viper in the 90s. Was better than Clifford.
My rig came with remote start and lock/unlock from Avatar or some such. It had no security. FFW to a couple months ago, after a close call with a theft decided to upgrade what I had to provide security. It wasn't able to be added.
So...decided to go with CompuStart w/security.
1) It's the only one-way system still out there. These days, you don't want your rig 'broadcasting' like what happens with 2-way systems imo. NONE of these systems are encrypted in any way.
2) GPS monitoring could be added to the unit I got, as well as phone-app integration. Prob imo here is that GPS is often tied to cell coverage, subscription, and/or you/your phones proximity to the truck. No bueno ims given that the truck or myself/phone is not in cell signal range much of the time anyway.
3) Ignition kill is integrated into the system, along with glass-break, motion, and hood lift sensor.
4) Added a second siren inside the truck in hopes to keep them out if they get a door open.
Total cost out the door installed, $500 09/2021. Best Buy. (GPS/app stuff extra)
It may have made things easier already having a unit installed by PO at some point. Presumably they used much of the same wiring. Still took 7hrs tho...