Sol: The Hts2000 is the only one that I have used and it was selected by reading reviews both pro and non pro and also by the price. It really helps with my system, but I also live in LA and have crumby power. I am now looking for something less expensive than the PS models that will help with power fluctuations as well. I do not really hear the Brown outs as such (they only last a half second or so and my gear seems to hold more than enough current in reserve for these instances) but I know that it is reducung the usable life of my gear. For example we go through a computer fan every 9 months or so and light bulbs do not last nearly as long as they should. Anyway, getting back to the HTS2000 it is hard to tell how much it is limiting, if at all, the power amp because it is the best of two evils considering my power supply. It does have two outlets that are designed specifically for amps. Every piece of gear, including both my SS and tube amps, sound better when running from the Monster, even in the early morning hours. If you check out the web reviews on the Monsters you will see, as I did, that this cheaper model is preffered by many over the more expensive models. Whether this is a chain reaction of opinions I do not know. Globalmart is also where I purchased mine on line and they were great to deal with as the item arrived 3 days after my order was placed and paid for. Right now I have a power conditioner coming in for our computer that I will also try on the main stereo. It is an APC LR1250 and was mentioned in another thread at this site as being good for our application (Hifi). There is also another thread "Best upgrade I ever made" that mentions another "type" of line conditioner that I would also like to try out and the company is a short drive from my home. For $125.00 I reccomend the HTS2000 for starters as in my situation it really does improve the sound by taming the dirty juice. I just need more especially with the power problems that CA is experiencing right now and dont want to see the power supplies and caps in my gear fail long before their time.