I have a monster 3600 II power conditioner. And i can tell the difference. Is it worth it? depends if you can get a good enough deal. I got a great deal on mine ( its still available at the sale price btw) and i love it. But its one of those things you dont really need it. And you wont know theres a difference until you use one. But honestly alot of it is just marketing. Its a really expensive surge protector. But i have an older house, and my wiring is a little old so i prefer to be safe about it.

Let me put it this way. Its not a bad investment. If you have the money in the budget go for it :)