I have a 2010 Tundra DC with the 5.7 engine, tow package, and 4.3 rear end. I absolutely love the truck! It tows really well for a 1/2 ton gasser. Doesn't get great mileage towing (right about 10) but it doesn't get great mileage ever. My wife drives it to and from work 8 miles each way in town and she averages about 12.2 MPG, hand calculated.
I can't compare it to many other trucks but I have spent a lot of time towing with a 01 Tahoe with the 5.3 and an 01 & 03 chevy 2500 with the 6.0 and I think it tows a lot better then both (especially the Tahoe with the 5.3). I think the Tundra is underrated as far as payload goes (but again so are most trucks now days) because I have hauled a lot over it's ratings without issue.
If I were to do it again, I would buy the crew max no questions asked. The double cab is nice and the back is large enough for most adults, but when we bought the truck we were 3-5 years away from having kids (so we thought). Only a few months later we found out my wife was pregnant. The angle of the back seat in the double cab is actually comfortable compared to the Chevy and Fords, but nothing like the crew max. I would compare the double cab to the pre 2010 Dodge quad cabs as far as room goes.
We have the 'bench' seat up front which is split roughly 40/20/40 and while it's OK, the seats aren't really comfortable on long trips. They are big, but lack lumbar support and other adjustments. Nothing beats the captain chairs in my dads Tahoe. Super comfortable on long drives and they adjust 100 ways
The stereo is complete garbage (even the JBL system) but I didn't care cause I have already changed out the HU and plan on changing out the speakers.
The truck has a few quirks though....
1. Bed bounce is a real issue for some owners. I haven't ever experienced it, but others on the Tundra forums have and say it can be bad. There is a 'fix' out there for it but some don' t like
2. The whole gas pedal issue has been proven to be complete and total BS so don't let that issue sway your opinion. The only thing that was wrong in the first few cases was a crappy design of the floor mats. Nothing more.
3. There is an issue with spindles or yokes or something that will sometimes cause some
Tundras 'jolt' when coming to a complete stop. I have only noticed it a few times when stopping on a step grade (such as my parents driveway). But for others it happens all the time. There is no fix for the issue as Toyota says it's not an issue. It would bother the he!! out of me if mine did it all the time.
4. If you get the 5.7 with the tow package it's geared low and stop and go traffic can be a bit annoying sometimes. I really feel like the truck just wants to be towing and not stopping every 5 seconds. Can't explain it in words, it just shifts 'rough' though that's not a good word to describe it.
You should really spend some time on www.tundrasolutions.com
and read up about real owners issues, likes, and dislikes. All in all I love my truck and hope that it's built with the Toyota quality of the past because I would like to keep it 10+ years.