HERE ARE MY INSTALLATION INSTRUCTIONS
Installation took me about 2.5 hours but if I did it again following these instructions it would take considerably less time. Keep in mind these instructions are the way I installed it and may not be the way you want to install it. Adjust accordingly. The SRT was the easiest of my three LockPick installations by far. This is due to the large amount of space behind the dash.
I will offer my candid feedback too and everyone can take it for what it's worth.
I have always been a fan of LockPicks and have them installed in all my vehicles. The CHR558 does not change my opinion about them. The CHR558 allows excellent iPod access and control by allowing the user to scroll through your iPod library just like you would on the actual device but by allowing you to use the steering wheel or radio controls. This is much easier than trying to find a song, artist, album, etc. using the touch screen on the SRT. The addition of the small remote gives you a third way to control functions of the LockPick.
The second reason why I like the LockPick is the video playback functionality. I have a 3.5 year old and rear seat entertainment is a must to keep her occupied regardless of how long the trip might be. For those of us who couldn't wait for the rear seat Blu ray system this is a very inexpensive alternative if you don't mind giving up your 8.4" screen while you drive. Just load up your iPod, select the iPod Apps function on the Lockpick and select which movie or show you want to play from your Ipod and you are all set. I will eventually have a rear seat screen setup and when I do I can route the AUX output from the Lockpick to that screen which will allow me to use the front screen while my daughter watches on the rear screen.
NAV in motion override is another great feature of the LockPick. The CHR558 is no different and allows the driver or passenger full access to the NAV menus while the vehicle is in motion.
Although not discussed in my instructions yet, I plan on installing a front camera. The LockPick allows unmatched control of up to four additional cameras. The front camera is a nice compliment to the stock rear view camera and is automatically activated at forward speeds of less than 7 MPH.
Only small drawback so far is that on the Cherokee SRTs we don't get LockPick touch screen functionality like some of other 2014 Chrysler products (300, Journey, and Charger). Would I use it if we had it? Probably, but the steering wheel controls are far more useful.
Feel free to PM me with any specific questions you might have. I will update my instructions as needed and repost.