This product works well with our application to provide data access for both oracle and postgres databases, we have found it easy enought to get up an running without any major issues at this point in time (it may be different if working from scratch).
As I said above there are no serious complaints so far but minor ones like performance could improve some more as compared to other similar products out there - otherwise its very good solution! We use Oracle/PGSQL DBMSs extensively across all applications using ODBC connectors through MS Access which uses linked tables via OLE automation interface implemented by pgnp library.