I just switched from a bank to a credit union a few days ago. I was planning on using the Arctic Cat financing until I heard that unless youbpay it off before March, the interest will be applied from day one. Someone else said that wasn't true, but I couldn't find the fine print anyway to confirm it one way or the other. In anycase I figured I'd check with the credit union as to whether they'd finance it and they approved it with a 3.99% rate, which is a ton better than the 13% rate sherfield would chatlrge.
In conclusion, don't be lazy and use the Arctic Cat one unless you have it paid off by the end of February. Even if you only have a 1$ balance come march, you'll probably get hit with a couple hundred bucks in interest.