I use this case on my Optimus S and I think it's great. Not sure how it compares to the OtterBox cases (I have an OtterBox for my Ipod Touch and it is excellent). When I was searching for a case, I found the Body Glove first and for 13$ plus high ratings in the reviews section, I went ahead and got it.
I also ordered a screen protector (2 for around 5$ on Amazon).
Personally I don't use the clip, but it's nice to have the option.
I've had this case for about 6 months now, it was great for a while. But both top corners have cracked and no longer snap together and the "skin" is peeling off. I never dropped it on the corners or anything like that.
while it was intact I loved it, but I'm disappointed by it durability.
i have the body glove one too...good to great protection, escpecially when used with a good screen protector. but makes the device feel bulky and look like some crappy cheap model. dont really use mine anymore as the screen is the only thing im concerned with preserving.