I just wanted to say after browsing around for a few days that I think the upgrade has made a huge difference to the usability of the forum. The modern search has enabled me to find some threads that in the past I would have used a Google custom search to do and I’ve not found any major issues so far.
Thanks to everyone who has worked on the forum over the years (and the mailing list before that), and specifically those who have performed this upgrade, ensuring that the wealth of often invaluable information continues to be available in an easy to digest form.