I am thinking about using one of those systems myself. I thought it would be cool to put in a new wiring harness with the fuse box mounted in the engine compartment and then put this keyless ignition in the engine compartment as well. This way all of the start and ignition wires would not be accessible from the cab, which might be a good theft deterrent if you could lock the hood. However the instructions say not to install this system under the hood likely because it is not rated for the heat. I also don't know of if the system would receive the signal from the the fob if it were mounted in the engine compartment.
Another thought I had was if this system could be installed in a locking box under the dash or somewhere else in the cab. If this could be done in a way to make the ignition wires wires less accessible then it might be a good theft deterrent.
I have also read that some keyless start systems can be hijacked. I don't know how much of a problem this actually or what circumstances would allow this to happen but it might be another factor in the decision.
