Only one question...
Why haven't you bought it yet?
Don't worry about Tunnies gripes

The Omega can easily see well over 250,000 miles, even driven hard. In fact higher mileage ones are a better buy as they've been kept in use, and don't respond well to neglect.
All Omegas suffer from:
Suspension wear
Heater Bypass Valve Failure
Camcover leaks
Coil/dis pack failure
Crankshaft Sensor
Steering idler wear
Central locking motors
Tyre wear from poor geometry
Typically these all occur between 80-150k, and every item is well documented and easily fixed.
Buy a car that's had the bulk of things sorted recently, but be realistic and expect to repeat them as you put miles on.
When I sold it at 285k, my ex police 3.2 manual was still on its original engine, oil cooler, gearbox and diff, and that was inspite of being written off three times and being used as a taxi.
Have owned 2.0 16v, 2.2, 2.6, 3x3.2, and imho the 3.2 is the pick. Easier to work on than the 2.5/3.0 due to less plumbing. Sure, a side effect of the dbw throttle is a slightly coarse idle, but that is also true of the 2.2, and only occurs because the ecu tweaks the fuelling to control it instead of the traditional ICV arrangement.
Buy that MV6 on visual condition, and don't look back
