I think the extra $10 is worth it myself. I plan to pick up a couple pots this fall, for winter pouring. I pour on my back porch is very very cold conditions in the winter, I think the pot would be safer than the pyrex!
Also do a search on the topic. There's lots of people that dislike the pots because it's hard to find the right temperature setting. If you have patience and don't mind burning plastic to figure it out, then go for it