well i have the Fosman and the Seidio. The Fosman slips in and out of my pocket just a tad easier than the Seidio, however, it is less griipy and easier to slip out of your hands. That really hasn't been an issue though as it is still a world better than not having a case.
The Fosman,as you open the kickstand, was begining to scratch the back cover as there is nothing between the back end of the hinge and the cover. Some could care less about the cover, but I do. I used a small peice of clear gift wrap scotch tape on the back behind the hinge and that seems to be working. I do think if I dropped my fon just right however, it would still likely break the screen if it landed on an edge or face.
The Seidio does add just a little bulk but not much. I feel it is a far superior case to the Fosman in terms of protection from drops or slipping out of my hand ( which has happened a few times now). I have had a couple of Balistic cases I used on my Evo 4G, and Evo 4G LTE (yup they're different

) as well as 2 or 3 Seidio cases. The one day I was using a cheap case, was the one day I dropped my precious on the ground from about 3 feet and shattered my screen.

Because of this one time, I almost never use the cheap cases :-$ and stick to the Seidio or Balistic cases. They are easier to hold in my hands one-handed while texting without worry of it slipping, and I have the belt clips for these as well so it makes these more useful for more situations or attire.
As for the kickstand, I use it often and have had no issues with it. I prefer Seidio's kickstand over the Fosman or the Balistic case. It's just my opinion tho. It does have a flimsy feel when opening or closing it, but I believe this is mainly due to a week spring (needed for the magnet to hold it closed) and a loose hinge pin. I wouldn't pull hard on it to test it's limits, but it has survived a few crashes so far and I'm happy with it. I have had it since December 2012 and it is my favorite. Grippier than the Fosman, Less bulky than the Balistic.
Hope this helps! If it does please hit the like button. Thanks, Jay