The price is prorated, so it goes down the longer you've been on Verizon. My wife and I dropped Verizon to go with AT&T, and instead of $175 per line, we had to pay $140 and $145. So, if you've been on Verizon longer than a year, it shouldn't be too horrible. We still haven't received a bill from verizon, though...
Either way, I've been having to fight AT&T due to bogus charges anyway. They billed me $109 for the three days my iphone was in the mail, and now our first month's charges are $223.82 when our monthly plan is only around $150 with a 20% discount on top of it. 😡 oh well, it's a cell phone company, I shouldn't expect it to be perfect.