Do a quick search online and you'll see there's a long history around this patent and ongoing litigation with Microsoft, Ebay, Shopzilla, etc. Have it ready for your attorneys and help them get up to speed quickly. Manatt is basically giving people only 2-3 weeks to pay up until they say they'll file the lawsuit, so they're banking on your not having the time to get your stuff together. Like I said, nice people. Welcome to the mafioso world which is patent trolls.