Using the (original) Asset Vamifier can enhance some scene with CUA environments dramatically (at cost of some performance). If it is for the shadows or the IBL... this is the way to go. But, did you ever wanted to add gloss to the floor and instead of this, the tapestry starts looking like being made from glossy plastic? This plugin gives you the options to compensate this. Unfortunately it starts to get extremely complex with many CUA materials, so you maybe better keep the original plugin at hand for the casual use.