Here's a handful, limited to players who actually played Super Rugby or Australian 7s before departing overseas and were/are still playing up until last couple of seasons: --Including players who didn't crack Super Rugby and went straight from club is took difficult--
Guy Millar, Spence Jeans, Les Maskin, Tim Metcher, Dave Lolohea, Hugh Roach, Pheonix Battye, Alex Toolis, Michael Stolberg, Sam Jeffries, Maclean Jones, Ben Meehan, De Wet Roos, Nic Stirzaker, Mack Mason, Chris Talakai, Kimami Situati, Tom Ross, Joe Powell, Alex Masibaka, Efi Ma'afu, Adam Ready, Feau Fotuakai, Dane Zander, Ryan McCauley, Isi Naisarani, Cameron Orr, Ray Nu'u, Stacey Ili, Ola Tauelangi, Rodney Iona, Michael McDonald, Tom Nowlan, Geoff Cridge, Tevita Kuridrani, Theo Strang, Andrew Tuala, Joe Cotton, Jack Whetton
No disrespect is intended for those players, but there are just examples of traffic heading over, not all of them improving infinitely in these environments.