Well, clearly from the example, they can look great! But if the whole of your website is flash, it can't be indexed by search engines, and is therefore not so good for SEO. So it can be a bit of a trade off.
This website uses flash but not as the whole page so the content can be searched and indexed (you can tell the difference because you can celect the text in the website, you can;t with the previous example).
There are tips and tricks around the net for optimising Flash sites for SEO but the overwhelming consensus in the Web Development community is that is less effective and generally a bad idea.
That said, Jasmine Watson's site is not a store, so maybe she uses it as an online portfolio that she directs customers to, and has no need to get high traffic to her site, in which case, there's not really a problem.
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