extension for due diligence

So Sigma just released an after market announcement stating that Aspen has asked for an extended time to complete their due diligence.

Good news or worrying news?

Either Aspen are delving deeper than expected because they are liking what they see and just want to make sure all ends are covered, or they just haven't had time to finish.

Maybe they need more time to re-calculate an offer price?

Anything else that can be read into this time extension?