Any precautions needed when filing for new H1 under AC21?

pkpkpkpk

Registered Users (C)
Hello friends,

I am eligible to switch H1s since 180 days have passed since my I485 filing. A company is going to file a H1 for me.

1) Should the new offer exactly match what's on my labor?
2) When should I notify the USCIS for AC21?
3) Some folks say that filing AC21 is optional, does this delay green card processing?

Kindly reply promptly as the lawyers are working on my paperwork.

TIA!
 
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