you know, im slowly becoming a fan of the plastic and alum combo. they don't break much because the alum isn't as effected by the vibrations of daily use and they cool better. they both have their ups and downs, but Sunday it was 102 at 4pm, i was sitting in traffic crawling down the road for about 20 minutes, decided i needed a dr. pepper so i hit the drive thru. they must have had to mix all 31 flavors themselves because it took 15 minutes to get the damn drink, then crawled back out in the traffic for about 10 minutes more. this damn truck after all that had just edged up where the needle was barely touching the 200 mark. as i got past the light that was holding up the works, i was watching the needle drop back to 185. really hard to argue with results like that.