Ah yes sorry should have updated on this, the conversion is complete, no one has seriously complained and I'm getting PC's saying how they love the new site. The last time I did a big conversion was from vBulletin 3 --> 4 and it was a disaster for a couple of reasons.
Firstly I didn't tell anyone what I was planning on doing so no one had a chance to get prepared for the change, this with zero build up from me and no offerings of a sneak peak etc left everyone shocked.
Secondly I had no idea what I was doing at the time of the awful conversion I had very little experience with all things web, at one point I had completely deleted my public folder and eventually had to call the host and ask for a full site restore. I also decided to do it after a litre of vodka, fun times. To add to the misery vB4 turned out on the whole an entire disappointment. So the site ended up being dead for 12 hours while I slept off the drink.
This time around I did everything properly, I gave plenty of notice, I gave some sneak peaks at new features, got a test site up and running asking for feedback and then actioned most of the requests. Set a rough date and stuck to it.