My experience has been FAR from smooth (it's not over yet). I took the van in on Wednesday the 12th. I had service scheduled prior to the Z11 remedy, but called once I saw it was available and they confirmed they would perform it in addition to the other services the vehicle needed (a couple of software flashes, coolant top-offs, alignment, etc.).
First, they did not have a loaner vehicle even though they stated they would when I called to add the Z11. Not a big deal as they found one after a half hour or so, but not a good start. They did seem to be aware that the remedy would take 1.5-2 days, so I was somewhat confident they knew what they were doing (I had never been to this service center before). They called the following afternoon to say the vehicles was ready and I scheduled to pick it up the next morning.
When I did pick it up, I noticed the battery was at 0%. This didn't seem right as I had briefly read through the remedy procedure
and thought at least part of the process involved a fully charged battery (I did not reference this manual at the time). I DID know they were supposed to return the vehicle with a full charge and a full tank of gas, though. I let this slide and went down the road to the dealer's sales office where I plugged into a level 2 charger and purchased an extended warranty for the vehicle (yeah, they got some money out of me).
After returning to the van (it had only charged to 27%), I opened the hood and found they had NOT filled the coolants (one was well under the minimum line). At this point I decided to return to the service center to get the fluids topped off and inquire about the depleted battery. I asked whether the Z11 procedure was performed completely and was told the final test was performed with the battery at 87%. I said that's impossible as the van had only been driven 7 miles (presumable to check the alignment) since I dropped it off. I was then told it was my word versus the technician's (not good customer service there). After further inquiry, they agreed to keep the van, charge it, and perform the final test in front of me if I returned later that evening. Sounded good to me.
I went home in another rental (a Dodge Charger, argh...). I then reread the remedy procedure several times and realized there was NO WAY they completed the procedure. Even if they performed a test in front of me, there was still a third and final test that needed to be performed after a 3 hour rest period. It was clear at this point that not only did they not complete the procedure, but that they weren't even familiar the process. So, I printed out the entire 30 page procedure, drove back to the service center (30 minutes each way), pointed out the exact steps proving they didn't perform it, and demanded my vehicle back.
(When I returned this final time, the van was plugged in and charging, but there were no cones or warning signs around the vehicle as stated in step 25.)
The president and namesake of the dealership called me later that same evening to apologize. Apparently somebody finally realized I was correct that the procedure had definitely not been completed and the incident was reported and escalated up the ladder. He agreed with me that this was a big deal and a major mistake and offered to do whatever he could to make it right. I agreed to bring the vehicle back with the understanding that the procedure will be supervised by several technicians and managers and whoever is available. My feeling is if anyone else brings their van to this dealership, I don't want them to go through what I did, so let's make them learn how to do it right.
So very sorry for the length of this post. It seems others are having similarly frustrating experiences. Had I not followed through and read through the procedure myself (thanks to this forum), I never would have known my vehicle's battery wasn't tested. I'll return with a hopefully shorter post to update whether I'm getting a new battery or not.