140 characters are enough. I am actually glad that there is this limit, it makes people write only important information.
I have trouble with character length, bitly helps but 140 is quite restrictive-shame twitters bandwidth limits it.
I like the limit, but i think it should be 140+ hash tags. Sometimes I don't have enough space for my hashtags
Sometimes are good,but sometimes not so..On the internet there are lot of spammers so it is good that have only 140 characters,but sometimes I just can't give my opinion like I want because of the limit
Yes, 140 is a good length I feel. It also helps me be more concise when I am writing an article. Why use 20 words when 10 will get the point across?
I don't think that this is the right question to be asking. The point of the 140 character limit on tweets is so that you condense your thoughts into a short, easily-readable and digestible sentence or two. If you require more, you should consider something else such as a blogpost. So to answer your question, yes, I think that 140 characters are enough for me.
I'm used to it already. From other hand if I really need to express longer I'm using long tweets free service at http://vicconsult.com/twitter-long-tweets/
Because sometimes 10 really won't! I've lost count of the number of times my tweets have been misunderstood because I've tried to condense the information into one sentence, I'd personally like to see the character limit a bit higher.