Yes, it auto-renews. I missed it once and called after it booked (so like 3 days after it appeared on my credit card) and they removed it no questions. I am not sure if you'll be able to get 6 months worth, probably not, but you could e-mail them and ask. They only way to stop this is to go into clonezone and cancel it (even if you only bought a month you have to cancel), but the poopy thing is if you bought it for a month and want to use it for the entire month, you have to wait until after you are done using it because it will not let you in if you cancel halfway through the month (even though you will be charged for the whole month).
Yes, all-in-all, the one month thing is a pain and a wee-bit shady...:sad: