if it is "revamped" then why are refurbished items carry less of a warranty. 30 days as opposed to a year or lifetime warranty? Something doesn't seem right. Maybe because your are taking a risk if you are getting a simply returned item or a defective item. Also, I don't know many people who buy alarms and are able to return them after installation.
Of course, everyone knows that your security is only good as your installer, but if your product sucks your installer can't do nothing about it.... If you get the right product it is one less thing to worry about. Do it right and do it once.
Save a couple of bucks and spend a couple of more later fixing it.....