"For ICD-10, I have been using ICD-10 Coder which is a periodical newsletter. Since SuperCoder is part of The Coding Institute (TCI) and TCI' s coding specialty newsletters are really helpful, I just took a leap and bought that. It brings out some very useful articles in every edition. Also, there's an "extended ICD-10" conversion tool in SuperCoder that shows the GEM as well as additional codes that are related but not exactly matching with the current ICD-9 codes. Found that pretty interesting since GEM is still evolving and assessing probable ICD-10 codes for current ICD-9's are sometimes overwhelming!
To me, Encoder is pretty costly, even though it's in market for very long and quite popular.
Incidentally, SuperCoder representatives called me last week to inform that their site would be in a new and much more "user-friendly" form in another week or two. So, keeping my fingers crossed!!