I use the VEA when there are only 2 of us, I find it reliable, and have had no problems with it.
This week, there were 6 of us travelling, so we booked rstransports. It cost exactly the same as the VEA would have - 90 euros one way - and we arrived at our hotel at least 40 minutes earlier than the VEA would have got us there. Great service too.
For the return journey, I use the TGV from DLRP train station to CDG. This takes 10 minutes, is bookable in advance, and gives me a good hour extra in the parks before we have to leave to start on our homeward trip.