I can only give four stars to the remote (I have the 5901 system) because the durability of the remote is pathetic. Within a month, the finish on the plastic starts to wear, and it looks like a toy gone bad. No one seems to have a protective case, other than a horrible (and expensive) leatherette square cover. The LEAST DEI could do is make a better case and sell that, or a rubber cover like the car makers have. The remote IS difficult to initially understand, but after playing with it, you will get the hang of it.
The range is incredible, and the vibrator is a nice feature as well. I like the Viper alarms, I just wish they would pay attention to the little details, like build quality on remotes!