I get that your offer is terminable at will, but your current employment is probably also terminable at will and your current employer now knows you have been talking to another company.That is somewhat of a concern....I dont thinknitd happen where it blew up in my face but there is that possibility.
As for backing out, they have this little fine print clause in the offer letter so...wouldnt feel great about it but #1 is #1
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