NIK software question

I am planning on getting more and more involved in B&W photography.  I'm currently using LR4 and want to pick up Silver Efex Pro 2 to compliment it.  Is it really worth purchasing the entire bundle from NIK which includes not only Silver Efex, but also includes Dfine, Viveza, HDR Efex, Color Efex and Sharpener Pro?  Do those of you that have the entire package use the other tools?  Do those of you that only have Silver Efex wish you had the other tools?

Thanks for your thoughts, I realize part of the answer is going to be that everyone defines their own path, I just want to see what others have found out after getting involved.

Thanks!