I have the 8.1:1 gear ratio, it is ridiculously fast. I have only had it a month or two, but so far I LOVE it.
On a side note, right now on TW if you buy one you get a rebate for a free long sleeve T-shirt, you just have to send $5 for S&H, but it says if you send cash it will not be accepted or returned. So, where does that $5 cash go?