I've been looking for some good examples of Unicode websites for you. I came upon a weird discovery. Unicode is not displayed correctly in Internet Explorer 9. There's boxes everywhere. But if I open the same site in Chrome, the website works correctly. I would imagine Firefox and Safari display Unicode correctly but I don't have them to verify. I also found out that some email sites, like Yahoo and Hotmail convert emails with Unicode into a different non-Unicode font. So if I write you an email on Outlook or Word with a Unicode font and copy and paste, Yahoo messes it up (but not every time).
So if you want to see good examples of Unicode fonts, don't use Internet Explorer. I would first recommend www.danacbe.com
. Then you can check out unboundbible.org (search for Matthew 1 in the Coptic bible and you'll see the New Athena font. I would also recommend copticheritage.org (it really does work. But not in IE 9). And if you don't mind reading the Gnostic Coptic manuscripts or Crum's dictionary, go to http://marcion.sourceforge.net/
I'm not saying you need to convert all your hymn lyrics to Unicode. If you wanted to danacbe.com has a converter tool. The benefit of Unicode is really seen when you use multiple languages. Switching between Arabic to Coptic to English to Greek in Unicode is simple. And in Oracle's Open Office, there is a Coptic spell checker thanks to Moheb's site. He even has Coptic OCR (which I couldn't get to work).
Bottom line. Unicode has a lot of advantages. The disadvantages have more to do with Microsoft and other big internet companies than Coptic Unicode fonts themselves.