personally I'd go with case-mate ... only cause it was the only one the store had LOL JK...
I dont like how the sides look on the seidio. looks weird to me. the casemate is very smooth. Now I did have a little trouble with the front cover coming off at times, but I think all off them are like that. it's pretty small so there's not much you can do about it, unless you wanna tape or glue it tight. but overall I think casemate is doing its job.
Casemate was no good for me. Front kept popping off. Got one from daydeal.com. Very durable. Just took my 2nd casemate back to the store and they gave me an otterbox which I totally love!
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Didn't like my seidio much it feel apart in a matter of a month and just picked up an AGF GRT case, solid so far, no wiggles but slide is stiff due to it sliding on the case itself
I ordered a two piece semi-rubber feel plastic case from Amazon for about $2.25 delivered to my mailbox. The rand name on the bag was iNsido. Anyway, I've been using it for a couple of days and I'm getting used to it. Fits very well, although the top piece doesn't completely take away my screen wobble. For the price I'm very pleased.