These cards are similar to the packages you would find at a pharmacy. For me, that means they are sufficient for most 'thank you' needs. Of course, I'm not particularly fancy, so card thickness or calligraphy doesn't much matter to me. I did want to make sure that they were standard-sized (so I wouldn't have to buy oversize postage), and they are. The price seemed reasonable, the 'Thank You' was legible (unlike some overly cursive fonts), and skipping the hassle at the store was appealing. I removed one star from my ranking because the pack that I received had some cards which were sliced on the fold. It was a straight line, as though a paper cutter had cut through about half of it - and only on some of the cards. I don't think my recipients will mind much, but you may want to check for that as soon as you receive them.
Rating: [4 of 5 Stars!]