They're good mate and I think the E class is cracking value for money

Check the gearbox oil if you're going auto, especially if you're looking at a highish miler, they like a seal at the front and aren't cheap if they need replacing.

Interior trim isn't as good as it used to be so check for bits that have snapped off.

For example I just replaced the cowling round the ignition barrel in one [40k miler too ] having said that it was only £2 for the bit - though I did lose quite a bit of skin off my knuckles

Servicing is cheap mate, plugs and filters aren't any dearer than any other car nowadays - try M-Benz dealers first, you may be pleasantly surprised And the engines are such an age old and simple design any monkey can work on them