The advertisement concerns me:
“Plug-n-Start” interconnect harness eliminates complicated wiring for a quick installation
To me that translates into No Felixbility...
To me that translates to "Harness provided so you don't have to hack up your ignition/keyless connections".
Note that I haven't seen or installed one of these, but it sounds like a "install-friendly" harness is included.
Clearly that isn't a bad thing.
If someone wants to add defrost or some other feature to this system, or even most other alarm/starters, they can add a relay to the starter wire to trip the defrost switch or whatever.
So the Rallystart is easy to install, works with the factory remotes, and provides remote start. Simple.
It doesn't have 2-way paging, fancy lcd status remotes, or a full fledged alarm with lots of inputs and outputs.
Most aftermarket alarm/starters do not have a plug-and-play harness.
I can see bagging on it due to the price, since you are up near the range of good aftermarket alarms(though install will be a lot more), or simply saying that if you want to add features in the future, they would have to be custom electronic additions (although that seems a bit odd since if you want features, you might as well get them now, when your new alarm/starter is installed, ie buy an alarm/starter that has everything you want and have everything hooked up).
I can't see picking on it cause it is simple, adds one function to your factory system and has a harness.
Obviously, if you want more than just remote start, it isn't the system for you, but if all you want is remote start, it seems to be a fine and easy choice.