Hi Kate, I know what you're saying. I've also read similar articles that say - whilst you THINK you can totally sterilise every part - milk can get backwards up tubes and get stuck, including on the Medala Swing. And they're illustrated with some not too nice images.
Saying that, I've been lent a Medala by a close friend and am going to go with it. The way I've rationalised it in my head is that I don't want to spend £50-£100 on a pump at this stage, only to find out I can't feed after all. My SIL wasn't able to feed due to liver medication after baby was lying on hers in late stages of pregnancy, and another friend became so anemic that she was told by doctors she wasn't allowed to. So whilst I'm hoping to feed, I'm just going to see what happens when I get there after another four months of pregnancy and labour etc.. So seeing this pump as a kind of tester, just to have something out away in a cupboard, if you see what I mean.
If I'm going to be definitely feeding, I may buy a new pump once baby arrives (although I may just buy new parts for this Medala) but really don't see too much of an issue with sharing with a friend - although I see your point that a stranger might be a different matter.
Do you have any friends who could lend one until you know what you'll be doing? Hope this helps - I know exactly what you mean from your post and have thought about it lots too. Xx