While I agree a botnet is most likely what's he's looking to use it on but it really could be useful for your own computers if for example you had a large group of rdsl lines or something along those lines. I actually use my rdsl lines as proxies in a different way as it keeps all my valuable stuff , accounts, content, etc, off a pc I don't have complete control over.
To answer the OP question learn to read russian and be prepared to spend $x,xxx for one that works well. The dexter's version you can find easily only works on XP machines and even then it's not that great.