We have around 38,000 miles.  We leave the AC in the auto position year
round to keep things lubricated and let the auto feature do its work.
Back seat passengers appreciate the ability to set the back seat temp
themselves.  I've driven a lot of 4 wheel drive and all wheel drive Toyotas,
and in very poor road conditions, like 8 inches of snow with ice underneath,
the Sequoia is probably the most sure-footed Toyota I have driven, except
for the All-Trac Camry, which is no longer sold.  Although ours has traction
and stability control, the only way I can get either to engage is to go in a
large parking lot that has not been plowed, leave it in 2 wheel drive, crank
the steering wheel, and floor it - you get a couple of beeps and it starts
going.  The owner's manual suggests using the 4WD at least 10 miles a month
to keep things lubricated so we use it on rainy days.

Depending on what is wrong with the AC, $2000 sounds a little high - you
could replace a big chunk of the system for that price.  $1,600 sounds high
for the brake booster and $1200 sounds high for rotors.  More likely, $1200
gets you pads and rotors for all 4 corners, but if you replace pads on a
timely basis, the price is much lower.

My wife drives the Sequoia most of the time, I use it to go camping and
climbing.  There are plusses and minuses when driving such a large vehicle -
probably the same plusses and minuses you get with competitor vehicles.

I get about 14 MPG city and 18 MPG highway, my wife gets 12/17 (although it
is about the same as a friend's Ford Explorer, which is a smaller vehicle).

3rd row seat room is decent even for adults, 2nd row seat room is very
generous.

If you are a heavy packer on trips like my wife and daughter, the cargo area
is nice.

The step up into the seats is pretty high.  If you're short like me, putting
stuff on the roof rack requires the agility to climb on the tires or a step
stool.

Parralell parking is a challenge due to the long wheelbase and it is hard to
find big enough parking spaces, and rear visibility when backing is poor,
partly due to the heavily tinted windows.

Driving position and forward visibility on the road are very good.

The engine is very smooth, with good power and torque.  I've towed over
4,000 lbs with no problem.  Even when driving with 8 people, a loaded cargo
compartment, and a loaded roof top carrier, you can barely notice a
difference in performance.

The 4 wheel disc brakes provide excellent stopping power, especially with
the electonic brake force distribution.  We've come close to being
rear-ended because people don't think something so big can stop so quickly.

The 3rd row seats are removeable although they are not very light and take a
bit of muscle to lift.

I always check overhead clearance in parking garages - we have always fit
but it looks close.  I had to re-adjust our garage door so it goes all the
way up so the truck fits, and we have to lower the antenna to do so.  The
Limited's power retractable mirrors make tight fits easier.

The seat heaters (A.K.A. bun warmers, tooshie toasters) are a nice feature
and work more quickly than our Lexus.

The cup holders will hold a 1 liter Nalgene bottle.

As for reliability, ours has been virtually problem free.  A friend bought a
V-8 Explorer at the same time we got the Sequoia in '03, and they had
problems with brakes and the transmission and ended up trading it in for
another.

If you need the ability to carry 8 people in comfort, tow 6,000 lbs, or get
through bad road conditions, then the Sequoia is a nice choice.  It was very
handy for moving kids to and from college.

The Tundra pickup, which the Sequoia is based on, is going to be redesigned
for the 2007 model year, looks quite a bit different than the current
Tundra, and will have a 5.7 liter engine (the Tundra/Sequoia/Land Cruiser
currently have a 4. liter engine.  My guess is that the Sequoia will be
redesigned shortly after to mirror the new Tundra.