They are excellent. My son was singing their praises the other day, again they stopped for water at no charge.
On return a little early to Gatwick, he got on a train, and then got asked to get off at the next stop because the ticket wasn't for that particular train time.
He got off and onto the next one which was busier.
He couldn't help but compare the attitude of the 2 personnel and wasn't impressed at the welcome back to England mentality.
We've used them ourselves loads of times, and for guests too. Always reliable and on time.
We did have Michael Schumacher on one occasion, but did tell them in their follow up questionnaire.