My parents went to Austria with Shearings- although I don't think it was that exact tour. They love going with Shearings and it was one of their favourite holidays.
What do you want to know about the tour , other than what Fiona has just told you? My parents also went on a few Shearings coach holidays though many years ago., as far as I can remember they enjoyed them. They did complain a couple of times about long waits at pick up points but that may have improved now.
I don't live far from the Austrian border and have visited the area where Pertisau is located. If you have any questions about staying in Austria I might be able to help.