Yeah, it's my main phone. Sometimes I swap it out for my 6682 on the weekends if I doubt I'll be texting or will need a camera (the one and only thing I wish the e61 had, btw...).
The width doesn't bother me, and it's much slimmer than I had expected. I had the 8125 before this, so I'm obviously not from the "smaller is better" mindset.
The longest call I've had on the e61 was for about 45 minutes and it wasn't a problem. For me, at least.....
The speakerphone is ok on it (I'm no expert or even picky on this, so take that comment with a grain of salt..), so you can always put it down if need be.