I was recommended to this site by a friend, who sent me a beautiful card - angel kisses. It took a little while to download, as they all do, but it was well worth it. The design was not as tacky as some on other sites, the quality seemed that much better. I too, experienced some stops and starts during the downloading, as did the previous reviewer, but I feel the messing around was worth it.
Passionup.com is more than just an e-card site though. they have a newsletter and lots of options and links to other sites. You can even get your daily horoscope. They seem to be trying to make more of a community feel to it, than just a site you go to to send an e-card to a friend.
As for their selection of cards on offer, they have them for every occasion and some are very detailed; pretty high quality. Ive been to some sites and the drawings are almost stick drawings, or they are caricatures, and Im not really into those styles. I understand they probably take less time to load, but I think if something is worth waiting for, consumers will be that little bit more patient.