I’ve personally had more callbacks and issues after Argus installs. What I don’t like is that all the contacts are internal. If you have an issue (besides a wiring problem or incorrect setting), you have to change the whole unit. I prefer the units that have dedicated relays for each thing they monitor, which can just be changed on site if there is an issue. You also need to be careful when setting the voltage thresholds. If your voltage fluctuates and you don’t have an appropriate threshold range, the car can run fine after the install and test, but then start having issues soon down the line.