How important is the "damping factor" When looking at amplifier

[spnkysprky]

specifications or does it matter? This is a question for those amp techs....If my memory serves me,the higher the Damping factor,the better.Correct?Please explain answer.Im shopping for a good 1000 watt or more amp to power 2-10"Boston Acoustic G5 subs.Im comparing specs.So far I have the JL slash 1000/1 in mind but a bit pricey or an ALPINE PDX 1.1000.The Alpine has some negative areas that kinda bother me,but its efficiency is remarkable....any ideas welcome