They are very expensive. I would recommend saving your money, and either buying a cheaper product (whey concentrate), OR buying a comparable product from someone with better prices. I prefer to just use a cheap whey concentrate. The only place I've seen a claim made that these products are more effective than whey concentrate is in 'research' funded by the supplement companies.
Nitrotech products are a blend of whey concentrate, hydrolized whey, whey isolate and creatine. I don't know what the proportions of these ingredients are.
They spend a lot of money on marketting (propoganda).
This question gets asked frequently, and no-one advocates spending loads of money on these more expensive forms of protein. Some people have obtained good results with creatine, but there's more to creatine supplementation than just indiscriminately gulping it down in your usual protein shakes.
If you must use a more expensive blend,
http://www.proteinfactory.com sell the upmarket ingredients (hydrolized whey, whey isolate) for prices comparable to store prices for the cheaper whey concentrates.