Do the silicon cases fit the 5800 tight or are they loose and pretty much no good after 2 weeks?

I don't use a case or screen protector.  I have unprotected text!  LOL! 

Now that case does not want to move when you are holding it or say turning the phone from portrait to landscape? You know what I mean, just everyday use. It wants to stay in place? Every silicone case I have seen or tried on different phones, just wants to fall off. It would be nice if they would stay on cause of the grip that they add to the phone.

Yeah same here. That is why I am asking Cellular-Decay about his.

On another note, has anyone tried out those cases on ebay that only connect to the back of our phone? More than likely not cause so far the people that have responded in here have said they do not have a case. I am debating something like it, cause sometimes the phone feels a little slick in my hand when I go to pick it up.

The skin I am using fits fine for my needs. As I said before, it's easy to apply and remove, but it doesn't slide around or slip off. I don't know how you would define "tight" but my case does not "want to fall off" on its own.

So is it super tight with no flex or movement at all? No. But it stays in place well enough. I even use it in a somewhat tight fitting leather belt case, and sliding it in and out of the belt case does not dislodge the skin.

Does it flex or move at all while using the phone? Yes, a little. The long edge will flex and "gap" a bit when using the screen lock switch, but it always returns to its proper place.

So if you want a super tight skin, this is probably not the one. I doubt any flexible skin that only covers the edges of the phone will ever be super tight (how would you tighten the sides of the skin on such a long, skinny phone?). If you want tight, get a snap on hard case, or maybe try one of those skins that partially covers the front of the phone as well (covers the top and bottom, non touchscreen areas with holes for the speaker, camera & sensors, and molded buttons for the buttons on the bottom).

I'm happy with the skin I'm using. I have been using it now for around a month and it has never fallen off or slipped out of place (and it has not gotten any looser with use).