Leosghost - 5:12 pm on Mar 10, 2013 (gmt 0)
Depends on how good / secure "the proxy" is .. the vast majority are crap and leak the original IP..
I also test through secure proxies ..I run GEO targeting scripts so have a good idea of which are leaking and which are not..plus I run my own..and check from machines which are not mine and not at my IP..nor even in the same country or continent..
They give"clean" results..compared to my IP run "straight" they are not personalised for me..
But..they are still getting results personalised to their own IPs..as are all searchers and thus all our visitors..