3g is pretty useless. Web browsing isn't exactly fast by any means on the kindle - it can't even follow most links/external links, it reminds me very much of 128k ISDN. Seems slower than my 3g phone (probably the browser's fault). If a site has a mobile (phone) version you should be ok. But it's really really really really slow on 3g. Like 5 seconds for text only pages minimum. If there are images and such expect to wait significantly longer. Many pages will hang/not display correctly. Some pages will take so long to load that the device will run out of memory and fail to display the page at all.
If you are going to use the web for blogs and stuff, and you are going to use Google reader, then 3g is probably worth it, but other than that, its use is minimal. Wiki/dictionary stuff is also viable.
Unless you are getting DX model, you will also have wifi to fall back on.
If 40$ is not a lot to you, just get it. I mean, who cares... it's only 40$?
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