What peoples thoughts about the state of this provider. The currently 
limitations I see currently with it is:

poor handling of larges datasets (e.g http://hub.qgis.org/issues/4604)
doesn't support WFS 1.1 or WFS 2.0 (or GML payloads that go along with those 
versions)
doesn't support setSubsetString.
poor operator support for filters e.g no LIKE or spatial stuff
Doesn't query GetCapabilities to determine supported functions or operators.
Poor user connection UI (i have a patch to improve this to using 
QSortFilterProxyModel)

I wondering if one way to deal to a lot of these issues is to use the OGR WFS 
implementation with QGIS. As of OGR 1.9 its support for WFS is very good. 
Benefits are:

common code (worked on by more people)
handles filters better
handles talking to different implementations of the standards better (e.g 
mapserver, Geoserver, deegree)
handles fetching larger datasets better e.g with paging support etc

Of course continuing to develop the current driver has the advantage of tighter 
integration with the QT framework and QGIS. Such as utilising QT network and 
proxy management.

Cheers,
Jeremy

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