colinmd
I personally think the Seitz are horrendous prices, as for condensation I've also seen that on Seitz .
Here's the deal, a top hinged window may get condensation, but if fitted correctly it will run out of small cutouts in bottom of rubbers, bonded windows will throw the condensation back into the van.
This is a problem I'm trying to solve at the moment, we have one 'double glazed' bonded window in back of van which causes more problems with condensation than the other 6 windows in back put together!