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I don't like Apple operating system upgrades. Seeing as I have to pay for these upgrades I would expect more features, what you get instead is tweaks and lots of my CAD/BIM software not working because Apple don't share their full API with any developer until after release.
Apple will tell you that there are more than 250 new features, however on closer inspection a lot of these are bug fixes masquerading as new features. Here's a tip - when Apple say something has been 'improved' they actually mean it has been fixed, and there's quite a few 'improvement' boasts with the release of Lion, including basic OS stuff like drag-and-drop operations, RTF translation, and autosave.
If you've used any other operating system you'll realise that these new 'features' are actually basic requirements for a grown-up operating system. There's some snazzy new gesture controls, app tweaks and connections to the App Store that make it easier for me to connect and give Apple more money, but any points that Lion wins with these improvements were lost when I tried to do any actual work whilst using Lion.
There is a serious font issue in Lion that affects your web browser, but has also affected photoshop and some other CAD products I use. Nothing has been fixed, the developers of this software are hamstrung as Apple's API is very jealously guarded, and Apple are too big to admit any sort of wrongdoing on their part.
So I'm back using Windows 7 on my other machine now. Okay, it's not as stylish, but at least it lets me get work out of the door.