What is the market opportunities of real time softwares like osisoft pi aspentech infoplus and invensys wonderware in terms of usd .All these are historians and heavily used in plants and Oil and gas?

I know all theese systems working. They're fine, but the last week I saw a presentation of the IDbox System, and I am wonderfully impressed!!Web based techology, quickly, high usability and performance... anyway, all of them are good for oil and gas. I think PI System are more extended in this market.