v1 will go down in price , but i think if you don't mind waitting just get v2, as its already announced..
My experience of v1 was good until then its suffering for front focus/ back focus .. i can't remember.
i brought it to canon for repair. and keep coming back at me without it being fixed ( 4 times ) they asked me to pay for the repair twice... i suppose the last one , it took me almost a year to bring it back for repair.. see, i'm just too tired bringing it in.
anyway i'm sure lots have good experience with it. but for me, its not.. i do use it a lot for work, perhaps its just worn out.. but i think this version seems to be having this problem, if you google it.
again, i'm sure most of you guys are loving this lens.