Moving from .Net Developer to CRM

Question

Hi All,
I have got an job offer in MS Dynamic CRM.

I have 6.3 years of .Net developer experience. In that around 3 years in Asp.Net MVC 3 & 4.

Is it correct to accept this offer. i.e. to work on MS Dynamic CRM for a year or so?

How it affects my career in long run?

Please guide.

Thanks in Advance.