Edmo is having a cracking season in Super League. I don't think the Roosters would have to pay him that much either, so he would be a great squad player for them. He is certainly capable, whatever nospam49 may tell you, of playing competitively in the NRL.
I would rate Edmo as the fastest prop forward I have ever seen. He is a tall lad and is the only prop I know who could genuinely outrun most fullbacks in Super League.
His impact isn't all that great, but when its at that speed, it hurts the defense anyway. Put him through a gap from anywhere past your own 40 and he can finish it from there. There have been many occasions this season where he has been put through a gap by Cunningham and gone round the fullback. His support play is magnificent and his defending is very solid.
All in all a very, very useful player. I hope Saints don't lose him.