Upgrade?

[bbhs2320 0]

I currently have a 15 in mach 5 ixl with a sundown 1000 watt amp. I have about a 3.5 cubic foot box with a port. And i recieved my email from SSA and saw the 15" icon is on sale for $295 and was thinking about upgrading to it. I really like my mach 5 because it hits extremely hard just for having one sub, it sounds really good with all types of music but i mainly listen to rap, and I was wondering if you guys think I should do the upgrade. I havent heard an icon and was wondering if it would hit harder and if there would be more positives than to negatives if I would switch subs? Thanks.