I like everything about Windows 8n now. Both Modern UI and Desktop (Ribbon in Explorer - Cool!)
I found the transition a little difficult at first (in the Developer Preview...) - I tended to shy away from the Modern UI apps, especially Internet Explorer. Actually, I still prefer the desktop version of IE on the PC, but have no qualms using it on the Surface 2 (Prefer it to the Desktop version lol).
I didn't really start using the Modern UI apps fully until the Release Preview, but now I use apps over web pages (NeoWin, Kindle, Weave, various players for British TV channels, Netflix... You know the list by now!)
I don't have any 'specialist area' to speak of, but it is fine for everything I need.
Tips & Tricks? Yes! - The best was that "Why I love my Surface 2" video on YouTube.
As for new users - Give it a go and stick with it. Especially the Start Screen. You'll here of loads of people whining because the Start Menu is gone. Well, the Start Screen is SO much better! Microsoft actually put a lot of research into how the start menu was used and concluded that it wasn't much any more (Most people pinned their favourite applications or just used the search function of the start menu). Also, they concluded that the tiles are much easier to get to and use.
Also, I got a touch screen monitor to use with Windows 8, but I hardly ever use it (Too lazy to lean forward...).
The mouse and keyboard input work very well anyway - Yet another complaint you'll hear about Windows 8 on the desktop which is untrue.
Another common complaint is 'lack of apps' - Also untrue. There are plenty of apps in the Store. It depends on what you need, but the complainers keep moving the goalposts every time the app they were complaining was missing gets added.
Seriously - Give it a go. I wouldn't go back to Windows 7 now.
Well, that's my opinion, anyway lol