I agree with what Flames has said, and - as he also mentioned - it's not us that you have to convince. It's all about the intent, if you have intention to take up residence in the U.S. and you cross the border and tell the border person that you are just going to visit and that is not your intention, then that is not true.
No one here is going to tell you to go ahead and give it a try, for two reasons - first, it's against the TOS on these boards, secondly because if it doesn't work out for you and you end up getting banned, we don't want to be responsible for that
As for a DCF timeline, there aren't that many IR1/CR1 Canadian folks who have done DCF here, a couple have recently though -
sroberts3000 - here is his timeline (just under 7 months):
Timeline: For IR-1 - DCF
Aug. 28/07 I-130 delivered and approved at Calgary Consulate
Sept. 7/07 I-130 Forwarded to Montreal from Calgary
Oct. 10/07 Packet 3 Received in the mail (reglular snail mail)
Oct. 11/07 DS-230 Returned to Montreal (regular snail mail)
Oct. 15/07 Checklist Returned to Montreal (regular snail mail)
Feb. 11/08 Received email with interview date set for March 12/08
Feb. 20/08 Medical in Vancouver
Feb. 21/08 Received interview letter in mail with correct address on it - finally
Mar. 12/08 Interview in Montreal, Visa approved.
Also
Daisylynn - took a little over 8 months, but they had extra documents to get.