We like ours a lot and can't believe that we are 2 thirds into our 3 year lease already. We looked at the Kia and chose the Hyundai mainly because of brand reputation (we had owned several other Hyundais) On closer inspection the entourage is a sedona with different trim since they come of the same assembly line and many of the parts are marked Kia.
The Entourage is selling poorly here while the Sedona is making good numbers.
I can't vouch for the diesel since we only get the 3.8L gas engine as an option for both models. Kia does sell the shorter version the UK gets here but it is very rare as most people like the seats that fold flat into the floor and larger cargo area.
This is the only other Entourage/Sedona owners resource I know of online.
Have you looked at the Kia Rondo (Called Carens) on your side of the pond? They have really caught my eye lately as a replacement for my Elantra. I'm not sure if it would fit your needs though as IIRC you are disabled. (I hope I don't have you confused with another user)