Change employer on H1b-I94 without Visa stamping

Dear All,

I was working on L1B and moved to H1B in last year Oct 1st 2013 but I didn’t go for H1B Visa stamping yet. My H1B-I94 is untill only 25-Sep 2014.

  1. Is this advisable to change employer at this time?

  2. Is this advisable to change employer to change employer without H1b Visa stamping ? Is there any risk?

Please share your experiences.

Many thanks.