Yes, Apple uses Lithium-Polymer batteries instead of the more common Lithium Ion. The only real noticeable difference is that Lithium Polymer batteries shouldn't suffer from the gradual decline in capacity that Lithium Ion batteries do. They should work just as well at cycle 300 as cycle 1. The trade off is that one day they will simply stop working completely.

If you use the laptop that much, I would be saving money to buy a new battery from Apple. Once you get to around 250-275 cycles, order a new one, so it should arrive right around the time your battery passes out of its warranty coverage. Then you can keep on using the original battery until it gives out, after which you simply swap in the replacement.