Does anybody have bad experiences of [heart] pacemaker replacement ?

There is a recent article on BMJ about pacemakers, and how they are not being improved in terms of 'battery-life', etc, with the suggestion being that this is because there would perhaps be 'less money in it for the manufacturers and doctors':

http://www.bmj.com/content/352/bmj.i228

The paper is not 'subscription' - anybody can read it, and it is not 'technical' - and one engineer has just posted an interesting response to the article.

I'm not saying that 'we can easily change this situation' - I'm posting this, because it is the sort of article 'which really makes you wonder !'.