To even put Bilya's name in the same sentence as Arshavin is blasphemy! Arshavin is maybe the greatest Russian footballer ever, while Bilya is just a very talented player who has not developed all that well. Don't even think for a moment that you are getting Arshavin or anything close! Bilya exploded onto the scene about 5 years ago and was thought to be the brightest prospect in Russia. However, he has been a huge disappointment over the last 3 seasons, where he has not progressed at all, and in the eyes of many, he has regressed. He has great ball control skills, a strong left foot, good vision and intelligence. But, he does NOT have great pace, he is not an accurate shooter and he makes way to many stray passes. He is also frail, so he can get knocked off the ball pretty easily. Contrary to what has been said in this thread, he is NOT a winger. He plays best in the center of the field. All attempts to have him play on the left side have failed miserably, including for the Russian national team. Gus Hiddink really like him at first and wanted him to be one of the cornerstones of the team along with Arshavin. However, Gus has been disappointed with Bilya over the last year. Bilya was the weakest midfielder on the Russian team at the Euros, and ended up losing his starting spot for the semifinal game against Spain (replaced by the talentless but hardworking Ivan Saenko). Since then, Bilya has not played in single game for Russia, and was only recently recalled for the upcoming international games after a few decent showings with Lokomotiv.
He is only 24, and perhaps he got too complacent in Russia. Maybe this move will spark something in him, and he can reach a different level. But please, don't expect any miracles from him. I would not be surprised if he fails in his first few games and ends up on the bench. But, if he gets the desire to prove himself, he could turn into a decent premiership player. Someone who could score 7-8 goals a season and provide as many assists. In the best case scenario, he could be a little bit like Aleksander Hleb, but not quite as good.