is BCEL a good choice?

Hello again,

I'm working on a commercial tool where I have to build some byte code
modification capability. I
need a byte code engineering library with features like:

   * offer a reasonable set of utilities
   * not buggy
   * allows byte code to be manipulated abstractly
   * free, even for commercial use :) (me being a poor starting enterpreneur
:)

Is BCEL a good choice? Or does someone has other suggestions?

Thanks,

W.P.