How reputable are british universities among engineering employers in America

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I got a feeling that most discussions about university reputation here revolves around American Universities. What do US employers in the engineering field think of British universities, Oxbridge and imperial college in particular?

And while we're at it, is it harder for british / European engineers to get american engineering firms to sponsor you for H1B visas compared to engineers from for example India and China?

 

[mgb_phys]

I think British universities are pretty well regarded (at least the top few)
The problem with H1Bs is that they are rather abused by software companies so it's difficult for any other company to get one, there are also increasing political pressures against them. Finally being on an H1B sucks unless you are treating it as a short term experience thing.

Assuming you are a new grad there are still a lot of american general eng grads around and it's easier for them to get certification if you are in an area where that matters.