they try to make the end user believe this is a better and safer technology when the truth is it really isnt let me put it to you this way ” I used to work for a locksmith several years back” i started when this technology first started to become available ..
1. you have to go back to the dealer or auto maker to get the newest keys because they are an encrypted technology copyrighted by the automaker they can keep all profits in house cutting out the other guys who used to be able to undercut them like the locksmith which also allows them to make the market price
2. it isnt nearly as safe as mechanical keys because they use radio technology to send and receive signals and any one who used a cb radio or has had any experience at all with cell phones or cordless phones it is not impossible to reverse the technology to created a copy or duplicate a signal even at 1200 Ghz you can pick up military radio signals on a home cb radio or some thing you can pick up at radio shack to listen in on police calls
3 mechanical keys used a weight and lever system of mechanic which if done right could be bypassed but not very easy and it could be made more difficult to bypass if need be by adding more combination’s of different weights which could also be cheaply done at the customers expense by going to a locksmith
4 high tech hackers are already in the works I can almost guarantee it