My experience with dotConnect is using dotConnect for Oracle over the past three months.
...when VS 2010 was released, it took Devart a couple of days to release an updated version of dotConnect. They had promised the new version would be availble within a week and they delivered it in two days. They also e-mailed me with a download link. They are responsive to e-mails and their forums are helpful.
Dean Hennessey, Assumption Life