Applied for H1B while in India : Dec 10 2009
Got Married : Feb 2010
Arrived in US on H4: 15 Feb 2010
H1B Approval : April 26 2010

H1 B Approval asks me to visit the chennai consulate for stamping

Our choices are
(a) Go to chennai for stamping
(b) Have employer file for change of status

There are no interview dates available in Chennai because of the travel season.
1. What are the risks with filing a change of status?
2. In your experience, what are the usual reasons for an RFE or rejection of change of status from H4 to H1 (other than travelling out of the country)