Never have and NEVER WILL!!
I installed two Painless kits, one in a 65 Mustang and another into a 68 Mustang back when I had my shop and after the second one SWORE I would never do it again.
I have installed probably a dozen or so Ron Francis kits in older Mustangs, Chevelles, Camaros, and my Pace Car. Everyone one of them was much easier, simpler, and better than either Painless kits.
Personally I will use the Ron Francis 24/7 kit on my 82 GT in the near future. I have chosen that because of the fuse box section being separate and having 18" of leads on it. That allows you to either pull it down from a location under the dash or attempt to mount it in the stock location with some modifications.
If doing the install in most 4 eyes, I believe the 24/7 main hub (where all the wires connect to the fuse panel/board) can be mounted behind the dash on the driver side either on the upper section of the kick panel or on the actual firewall. Then you can drop the fuse holder itself down from there or mount it in the original fuse panel location. Or at least that is my plan.
As I have mentioned before in other threads, all of these aftermarket kits will require you to retain/replace many of your OEM connectors as they either just are not available or are not included in the kits. The RF kit does come with the correct pigtails for the steering column switches, ignition switch, your distributor/ignition choices, alternator/regulator, and 4 Eye headlight pigtails. You will have to either reuse or buy new tail light sockets, turn signal sockets, etc. None of the HVAC pigtails are included nor any specific engine sensors, (unless you are buying their EFI kit).
Their instructions are second to none IMHO and they walk you thru everything. Honestly it will take the average guy anywhere from a long weekend to a full week of nights to get it all run and installed, but it just depends on your experience, skill level, how you want to run (hide) the wiring, etc. Well worth the effort IMHO and that is why virtually all of my cars have their wiring in them.
The only other kit I have considered is this:
http://shop.infinitybox.com/Default.asp
Allows you to do somethings like the current OEMs do, but with our older vehicles. Very cool and very high tech, but also NOT Cheap!
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