Personally, I haven't seen any. BUT, I lost count at the number of people who come up to me an ask me about mine. I've turned into an unofficial Microsoft Rep.
In my programming class the professor saw I had one, stopped lecturing and started asking questions, which version, how much ram, storage, how do I like the pen, what's the keyboard like, just about everything you could think of. As I'm answering, everyone in class slowly got up and huddled around me and my SP3. Then everyone started asking questions. We lost about the entire class time end the end with all the questions and demo's I gave, handwriting, OneNote, OneDrive.
Everyone lost it when I pulled out my Windows Phone and showed how everything sync'd up and how I could pull up my OneNote notes on my phone. One student was doodling on my SP3 and then it showed up on my phone, everyone's jaw dropped. It got weirder when I told them you could use OneNote on Android or iPhone and not just Windows Phone and that MS is more agnostic about getting their stuff to run on as many platforms as possible now days (not like Google or Apple as in it's their stuff and only their stuff).
It seems like every time after class someone holds me up to ask more questions. Prices, how does the student discount work, do you really get a 1TB of OneDrive storage with Office 365 University, etc.
My frustration is when someone brings me their laptop to ask me questions on their code and I try to touch their screen and nothing happens. I forgot how different manufacturers implement various touch gestures on their touchpads and they aren't consistent.