They take a beating.I pounded on a pair of tens daily,on a Mean Machine 99,hard enough that one of the dust covers blew off at me after a yr. on a trip,and still pounded a yr afterwards.I picked them up for a temp substage till i got a sub back under warranty, and actually ran those for almost 2 yrs straight.They hit low enough on the 99 in a 1.6 cu ft box ea with a 2.50x 7 in port that they hurt my ears.I was stoked.But warranty is only one yr verses the Hifonics.Never ran the newer hifonics,but 3 yr warranty may be worth the money.Might look into the Dayton DVC 4 ohm HO subs as well,as they have a 5 yr warranty,and do nicely in a small sealed enclosure @
Parts Express