i buy the pre-made stuff all the time. just reheat it in the oven and its good as new. well almost.
Liberte dairy products are the best on the planet.
im all over their yoghurts.
http://www.thenibble.com/reviews/mai...-group-300.jpg
except im pissed off because i cant get their maple flavoured variety out west here anymore its the absolute best. ive been assured that I should be able to gorge myself on some on my trip to montreal in april though.
http://farm1.static.flickr.com/19/15...64a966914c.jpg 
oh, and their coconut yoghurt is so good with berries and granola. its unbelievably decadent.