One thing in the 212's favour is reliability, the head tech from my dealer shops with me, and he said the 212 is one of the cars they see least. He said 211's, 203s, 204's etc. etc. were in on a daily basis with niggles and replacing control arms etc. and the 212 they see maybe one or two a month, like they used to with the W214.
He said if buying a used Merc as a family car that was out of warranty that would be where his money went.
Thanks gIzzE for the info its very useful, especially your experience with the F10 and W212, also its good to hear about the W212 reliability, does that also apply to the first W212's (2009/2010) released?
To me after research (and your experience above) it looks like the F10 is the better car but I would not feel comfortable owning it out of warranty (e.g. cannot afford a 15k bill for the engine going!), my budget (14k) will mean the car I buy will have around 80k on the clock, warranty will be £800 - £1200 every year with exclusions, after 100k I can only get a basic driveline warranty.
For me the key question will be (and this is what i've been struggling with for quite a while!), is the F10 that much better then the W212 to be worth the extra every year for the warranty?, my current view is probably not..
A colleague with a 3 series says he started leasing (hence warrantied) after he ran into a few out of warranty issues with his previous BMW's, I've done the sums however and for me leasing works out twice as expensive over the 2/3 year term even when I factor in depreciation, service costs etc of buying outright, before I start a debate I realize its not a fair comparison and I understand leasing is the cheapest way for driving new cars, above is just illustrating my specific scenario where I dont mind driving a car of a certain age
What I will say however is the new E class unveiling in January, in pictures anyway looks very good, has a very S class feel, some pictures of the interior look like the S class in fact, this should hopefully bridge the gap between the F10.
It was part of the reason why I started wondering if the very early W212's (2009/2010) are as reliable as tempting to save some money and just get a very early one (MB approved used) at the moment to minimize the depreciation curve, then upgrade to the newer much improved 2016 E class when its 2/3 years old, I reckon Hybrid tech will be a bit further ahead too so this may be a good approach.
I'll do some more thinking as i'm still not 100% over what car to get as I keep going back and forth, especially when I read experiences where the F10 comes out much farther ahead, I do appreciate all the responses it has really helped