I just got them a few weeks ago because I so badly needed new sneakers. I haven't noticed any soreness or a better butt (hilarious how they try to sell the shoes by saying you'll have a sexier butt. Yeah Right!) I only wore them around the house all day, no going out and hiking or anything with them. They are comfortable for me (I tried several pairs at the store & went with the one that felt best.)
The lady at the department shoe store where I first tried them was also wearing sketchers herself (a different style than the one I have) and she said she loved hers since she is on her feet all day long and when she started wearing these, she didn't have as much backache & tired feet as she used to. My back still hurts, it hasn't been miraculously cured but I need more exercise in general anyway.
Another thing the shoe sales lady said was to try them, take them home and wear them for a couple days around the house, you should know within a few days if they'll be comfortable and work for you. If not, take them back.
Just wearing these shoes are not going to make you be in shape any more than wearing something else and sitting at your computer is going to.
If you want, I can tell you the exact style I got, but I'll have to look as I don't remember right now. (I got silver-blue but don't remember the "name" of the shoe.)
I also first tried on a different brand of shape-ups shoes that were a little more than the Sketcher brand at regular price, but on sale was cheaper than the Sketchers. But I didn't like those. The sales lady also said that Sketchers made the original shape-ups and all the other companies followed. So knock-offs or as carefully designed, I dunno, she didn't know either. Bottom line, make sure they're comfortable for you. (and I wouldn't shell out $100 for them either but that's just me.)