I also suggest you burn them immediately (by June 30). I believe they are transferring at 1 to 1,000. 46 points within the next 5 days will get you a BF ticket from the US to quite a few places (based on a previous comment it almost seems system-wide). The equivalent after the change will cost you 2x - 7x more depending on how you interpret the new chart. I've posted a screenshot of the new chart but it's publicly available here:

http://unitedperksplus.united.com/chart.aspx

For a few of the rewards you'll have to call in. I posted details earlier. I'm still waiting to see an email confirming my BF redemption from June 15. I think I'll be calling in today...