I've had night and day contacts, after the month trial period i had for them i gave them up. They were horrible, they were constantly dry in my eyes at just about any time of day. The concept of them is nice, but for some people (me) they can get really dry and just suck, but for others they are really nice... just get a trial pair and see from there...
oh also, you wear them for like a week straight, get a check up see how they are in your eyes, go another week, another check up, another week, another check up until 1 month has gone by. The eye doctor will tell you how long you can wear them straight before you need to take them out for a night. (did that make sense?)