Count me in with leebee - I will think very carefully about renting from National again. We rented a minivan (used the Emerald Choice option). We arrived close to midnight on 11/28 and had no trouble at all getting the minivan. There were several to choose from. It did seem to take longer than warranted (about 20 minutes) for the agent to check us out, though. I gave him my EC card, my CC, my DC card and my brother's EC card as he was going to share the driving.
First disappointment came when we wanted to return the van at the Dolphin on Monday, 12/3. They do not and will not take cars there. We had to drive to the Car Care Center and then wait for the National van to take us back to the BWV. Not a big deal, but it did take up over an hour and one half of our time (instead of the 20 minutes I was expecting). I think National needs to update their web site and do a better job of letting customers know what to expect. Had I known this in advance, I would have either booked with someone else or booked the Car Care center directly instead of the Dolphin location. I paid extra to go with National because I thought it would be more convenient.
The most disappointing thing was trying to get a minivan for Saturday, 12/8. This was for our return trip. This actually took more than two hours. Went to the desk at the Dolpin where only one person was working. There was only one person at the desk and so I was next. The agent kept taking phone calls, most of which should have been directed elsewhere (IMHO). I think it is very bad service to take phone calls when there are people actually standing in front of you who have been there for some time. ZBy now, there were 5 people behing me. After the person ahead of me was done, the agent said a man standing next to me at the counter was next. Apparently, this was a Disney cast member who had been there earlier and whose reservation was completely messed up. I felt sorry for him as I couldn't help hearing the details. National really messed up! After about 40 minutes, they worked something out and it was my turn. My transaction took about 5 minutes and then I was sent outside to wait for the van to take me to the Car Center to get the van. THe CM was still there and we had a nice chat - he was from Great Britain and talked about how much he hoped to come back after his year was out to work for Disney as a computer consultant (his degree). Said he just loved America. Anyway, the van finally came ( about a 20-25 minute wait) and I got the van. Had to wait a little at the car center also.
The return at the airport went fairly quickly and was hassle free. Service at the airport is good.
But IMHO, National's service at WDW is well below my expectations. It is just plain awful! For the next trip, I will just go with Dollar or L&M and keep the van the entire trip (even though we don't need it the entire trip). By my calculations, it won't cost that much more - National's prices for vans seem higher than its competition. I was willing to pay more for the perceived convenience on WDW property. Since it isn't there, I'm exercising my right to choose someone else.
Hope anyone who is renting with National has better luck than I did.