I finally got around to upgrading yesterday (.180 T-Mobile -> .184 Orange France) and it went swimmingly well, probably one of the more smooth upgrades I've done on a BB. I did make sure to remove the exact same unwanted modules manually (the thread about deleting/moving the Media files, VAD files, etc. to save space) as I had in .180 so that the upgrade would "see" the same setup as I had before, and no problems ensued - it just worked nicely.

I definitely notice that my Wifi connections are faster to establish and seem more robust (less prone to conking out after idle a bit) than the older .180 firmware.