Yup, I've used that extension briefly in the past. It certainly provided nice features, but as with other similar extensions, it also altered the style quite a bit, which I wasn't too fond of.
I use HNES, but the only feature in it I care about is tagging users. I very much wish I could turn off all of the other features, especially its custom styles. If you were to add the ability to tag users to RHN, I'd be one happy camper!
