One of the downsides of mobile broadband is that you are less likely to get a great download speed than with a fixed line connection. Speed are improving as is coverage and these are only likely to improve as time goes by. However when I speak to people who have mobile broadband the most common complaint is not that they can't get a signal just that it isn't fast enough.
A recent report by Top 10 Mobile Broadband has said that those in certain areas are likely to be able to get quicker download speeds by switching to a mobile connection. The areas affected, which include Marlow and Henley-on-Thames, currently only get speeds of around 0.5Mbps for traditional fixed-line broadband. 0.5mbps is surprisingly slow connection for a fixed line, perhaps due to distances from a major phone exchange.
Whatever the reason for the poor connection those affected could get better speeds using mobile broadband. Some of the best mobile broadband connections would offer quite a change of pace to browsers in Marlow or Henley on Thames.