There have been a few threads about it. You might want to search for them. I'm not sure what the difference is, other than it may be a reseller of Medifast but here is a thread I saw about something called "Take Shape for Life by Medifast".
http://www.3fatchicks.com/forum/showthread.php?t=101920
When I looked up 'Take Shape for Life", it appeared to be someone who was reselling Medifast. There are some experiences shared in that thread though. Personally, I'd look at buying from Medifast directly. I also saw a recent ad for Medifast that had a coupon code of "Promo" to get a free week.