Well 2 things first.
1)This should be in the "Product Questions" forum
2)Please try to not make your titles so vague, and actually describe your problem so people don't skip over it.
As for buying them, check out the reviews in the Product Review section, they seem to be great cards, much better than the first. Getting it sent while it's cooler out will help but, you should also have porper card-clip just incase, if you want them to last an extra long time.
-RA69