Extended battery question (cheapy vs. Sedio)

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i found a big difference between the ones linked on ebay (same as amazon ones mentioned) and seidio batteries. i was getting literally 2 hours more out of stock bringing me up to about 10-12 hours depending on if it was medium or heavy use. the seidio i can get 20 hours + out of no issue. the one thing it does do is drain pretty fast down to about 80% and than it stops there and slows down to a slow agonizing crawl haha. i think seidio is the way to go and i personally like the feel of the seidio battery door in my hand better. (may not be prettier but feels better) but remember all will have different results because it all depends on how you use your phone.