Winter (J-Term) Rigor and Cost?

Hello,

I am kind of surprised that I could not find this anywhere in the subreddit. I am considering signing up for winter term classes as registration just opened up on May 1st, but I am curious on how difficult these classes are. We are limited to only taking 6 credit hours, so are they extra strenuous?

Also, should I be expecting a higher cost/additional fee for taking winter classes? From what I've read, the answer to this is no, but I just wanted to confirm with somebody who's had experience.

Thank you all!