I install these everyday at work, and agree DEI is the way to go. We sell Viper, and they have been the best system we have carried (as far as being trouble free).
It is a good idea to have them installed by an authorized dealer. In fact, we don't even sell them without installation due to the warranty. If installed by an authorized dealer, these units have a lifetime warranty on the "brain".
You should not use 3m connectors on the
heavy gauge wires. You may not have immediate problems, but I've seen melted connectors from this. They are fine to use for tapping into the other, lower current wires, just not the ignition harness. I always solder, heat shrink, and tape these.
From Viper install guide:
"All except the red heavy gauge wires leading from the relay satellite are used to energize high current circuits in the vehicle. It is crucial that these connections are made correctly so that they are capable of handling the current demands. For this reason, scotch locks, T-taps and other such connectors should not be used."
On a side note, another thing I've found the remote starter useful for is starting the Jeep to pump up the OBA when your under it working on something...lol