The former St George Illawarra, Penrith and Sydney Roosters winger, nicknamed 'Famous Amos' during his time in the NRL, scored 106 tries in 179 appearances in the NRL and is one of two new faces set to kick off the new season with Wigan when they host Wakefield next week.
The 28-year-old had never set foot in England until a fortnight ago but, having watched several of his old team-mates playing in Super League on television, he cannot wait to experience the thrill of running out at a noisy and vibrant JJB Stadium.
"It's the fans," he said when asked about the attraction of England, "the atmosphere. I've watched a few matches involving some mates over here and the fans chant for the whole 80 minutes. It's pretty spectacular.
"Nothing against the fans back home but sometimes it's like you're playing 13 against 13 but here I guess they are more into it. They are more patriotic about their team and it makes it more appealing.
"It's a lifestyle change too. I've been playing there for nine years and it was time for a change. I'm enjoying it and just looking forward to playing."
Roberts, who is also a useful goalkicker, was due to join Wigan on a three-year contract from 2010 but secured a release from the Roosters when the Warriors discovered a loophole that freed up a vacancy on the overseas quota.
Centre George Carmont's successful application for a Samoan passport enabled Roberts to bring his move forward by 12 months and join Parramatta hooker Mark Riddell at the JJB Stadium in time for Super League XIV.
"It was a long process but it finally came through and, as soon as heard the news, I got on a plane and came over," he said at Wigan's pre-season media day.
Wigan fans will have to wait another week to see the exciting threequarter in action for he is still recovering from a wrist injury that curtailed his final season with the Roosters.
"I snapped my wrist and couldn't get it operated on until we finished the semis," he said.
"I'm still about a week away so I'm looking forward to playing against Wakefield next week.
"I've been doing a fair bit of fitness back home and joined the boys for the camp in Lanzarote. Everything is fine."