Hi Dan,
The difference in the Xtreme 180 Cone and the Mini S is that the Mini S is 1 piece injected while the 180 is a rolled cone. So I guess the main difference is that the Mini S is built a bit beefier.
Pic of XTREME 180 Cone:
Pic of Mini S:
Both skimmers are available to be shipped ASAP. Please allow 2-3 days to arrive at your door once the order is placed. Please PM me if you would like one of the above.
Thanks
Paul