Usually, the I-129F is administratively closed, and continues as a CR-1/IR-1. Sometimes, USCIS then approves the I-130. The major disadvantages of a K-3 (and K-1) are:
- Adjustment of status is required ($$$$$$)
- Applicant cannot legally work in the US for up to 8 months
- Applicant cannot leave the country (& re-enter) for up to 8 months
- Applicant will not receive Green card for up to a year or more after filing for adjustment
- Applicant clock to qualify for citizenship does not start until Green Card is approved.