I drove one and they are really very nice. The motor is superb, the interior is rather nice now, and finally GM has a decent tranny - a 6-speed.
I wasn't really planning to use my titan as my daily driver, but that is how things ended up. So it has become my 95% driver and I logged 20K miles on it last year. I really love it for the utility and the towing capability - I tow a race car about half a dozen times a year. But for daily use it is growing tiresome - a bit cumbersome to deal with in parking lots and making U-turns. I drive a fair bit for work - I am in outside sales in the semiconductor business. Which - yes, makes it a write-off for me :teethmast
The kicker is the wife never liked the Titan and told me not to get it, which I ignored. Now she pretty much doesn't even want to ride in it - claims it is uncomfortable for her - and this is our primary trip vehicle. So that makes things a bit difficult for me....
So I started looking around at slightly smaller and more lux oriented SUV's - so far I've checked out the Denali and the GL450. So far I like the Denali better - more interior space, and that 380hp / 417lb-ft motor is just sweet!! The new 6spd tranny is nice too. The ride is pretty close to the benz. And I found one that I can assume a killer lease deal, so this is really tempting to make the leap.
If I keep the Titan I will have to sell my 69 Camaro and pick up a sedan of some sort to use for a good portion of my daily driving and for family road trips. Which also might be a pretty good option. Even if I switch to an SUV I may end up selling the 69 and getting a more practical car, but more likely would get something a bit more sporty like an M3 if I have something as nice as a Denali as my "truck" because that covers a lot of bases for me.
My Titan is a 06 LE and now has 28K miles on it. 4x4 of course - skiier here.