Hi,
I too have had some bad readings with the Dew point, and before that it was the pressure all wrong for weeks, now the pressure readings are back to normal, and without any involvement from me !! really weird. Also sent them an email, didn't get a reply.
If their quality control is sorted out it works very well, have used it for years and had very little problems with it, also there are not many sites that offer quality control over the data they receive, Awekas has quality control, but again not many others, so Madis / CWOP gets to be relied upon.
Nick. dw7240.com.