I can't say that I've ever had an issues running the Lexicon Lexiverb plug-in. While it doesn't take up too much processing power, I still use in on an auxiliary channel to save processing space as this is what I do with all reverb plug-ins. I have run the plug-in on a Pro Tools HD system that runs on an Apple G5 computer and a Digidesign 192 I/O interface. I'm able to run this plug-in on this system without problems every time as the HD system is very powerful, but this could be a different story if you are running an LE system or an equivalent to it. The plug-in's performance really all depends on what type of system you are running it on.
The sounds that are possible with the Lexicon Lexiverb are extremely versatile as I would say that this is probably its best quality. All of the unique parameters add up to the possibility to get some pretty awesome tones. This being said you can definitely get some more traditional reverb sounds in addition to the stranger ones. The sounds on this plug-in aren't the warmest sounding reverbs that I've used, but this is to be expected from a company that works in the digital domain and from plug-ins in general. This isn't the most cheaply priced plug-in, but the price is reasonable and is definitely an option for both home and professional studio owners. I'd definitely recommend this plug-in to someone looking to get a great reverb plug-in.