About 3 months ago I implemented a massive URL structure change by 'upgrading' some of the features of our CMS
Prior to this URL's for catergorys and products looked something like this
http://www.thefurnituremarket.co.uk/proddetail.asp?prod=OX09
I made a few changes but din't implement it fully as I felt it would be better to do it instages as the site was getting indexed more thouroughly.
HOWEVER...
We have just hit the first page for some key SERP's and I am wary to rock the boat again by changing the URL structures again and all the sitemaps.
How much pain do you think we could feel if i went ahead and optimised the URL's fully?
and
What would you do? 