Yes they fetch by proxy swithcer.
And Yes they are not smartbro proxies.
I'm been using alternative proxies because I'm experiencing a lot of traffic with
121.1.3.194 and 121.1.3.200 during peak hours
plus an alternative proxy is good to bypass a download limit on rapidshare.
Yes, you may experience error link when using those.
Yes, they even also sniff private proxy... now all I need is a pass