I bought it and got a refund for it in less than two days, I really wouldn't recommend it and I'd tell you to invest in other superior services.
I found it terribly clunky and slow, it crashed a lot and I found it badly coded, out of the 1000s harvested in ProxyGoblin none of the proxys passed in Scrapebox! I tested it using other sources and it was SLOW, very slow. I don't want to spend all day on my proxy software trying to get it to work! Personally (no offence intended) I am shocked that Rushdie who on another thread says he's a coder sings it's praises? Maybe it's been improved 100% since I used it, but i'd expect an entire software re-write for it to be anywhere close to "good". As SB proxy harvester is over saturated and being hammered every second of every day, ProxyGoblin is aimed at basic warrior members looking for SB alternative proxys and don't really have a clue IMO.
The only positive thing about it that was that it ported proxys into SB and other IM tools, direct from the software, but it was not a good program IMO, it was very slow and personally I'd not trust the protection of my servers IP on something that I found to be so buggy and badly coded.
I don't have an affiliation with either but I opted in for Jrim Softwares Proxy Multiply (as above) which works great and is much faster than ProxyGoblin. Also...
ProxyGo's service which is simply awesome and a must have for any online marketer - http://www.blackhatworld.com/blackhat-seo/buy-sell-trade/349175-scrapebox-daily-proxies-list-700-proxies-per-day.html
These mean my daily proxy work is about 10 minutes to be running all day long and never had an issue.