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I had the problem of text alerts not working, Since the update, I haven't missed one yet.
Tried out the "extra alerts" also. It does work, I ignored a text, it rang again about 5 minutes later, then rand again a little later than that.

Fingers crosssed,,,, but it seems like they fixed it!!!!
 
I recently obtained unlimited txting and now with 2.1 I have not missed an alert. I have been using my iPhone excessively tonight and am pleased to not have to reboot because the alerts become laggy/nonexistant. I'm very happy with it. I've sent 100+ texts tonight and I have no lag at all with numerous Apps being turned on and off... Very Happy!
 
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