Yes I did. The report says 2) The effect of the grips on the iPhone 3G is much smaller. But, the Full-Grip still reduces the data rate on upload..
That screen shot I posted is with my fingers lightly gripping the phone and bridging the aerials. I never had these issues with my 3G.
I think the image you displayed does not cause me any surprise. You have one bar of GPRS signal and have <10k speed. Now if you tell me that this happened on a place where you had decent 3G reception and then 'death-gripped' which caused reception to drop to one bar GPRS then I agree with you. I too own an iPhone and where I live is an O2 indoor dead zone for 3G so I get your speeds - but being where I live I am on my own WiFi indoors. Outdoors I get a couple of bars 3G and speeds are fine - unless I actually try to see that I can kill my signal. In which case, yes I do drop down to GPRS.
I hope like many others that Apple come clean and have a good solution for us sufferers - I have dropped calls indoors due to the reception - but I don't expect anything like a recall. For me, I think the answer is to be aware of where I am in low signal areas on how I hold my phone in use and also to use a case. After owning an iPhone 3G for 2 years I am a little disappointed that this new iPhone does something worse than my previous one. That said the rest of the things it does it blows the previous one aside, and I will keep it rather than return it. If the reception issue bothers/affects you (or others) more than this I suggest that you return it - either for an exchange or a to buy a different phone.