I have one. See post #127 of this forum for details.
I'm still on AOSP v3 rom. Biggest issue for me is notification LED not working but I can live with that. It takes great photos and GPS works fine. Battery seems to run out quite quickly but I don't think the ROM has been optimised for battery performance. Don't get me wrong, I still get a good 1.5 days of use out of it but I guess I was expecting more.
I'm on Three network and get 3g and 4g when available.
I made a similar post on xda forum that also lists ROM dev sites if you are interested.
Post #80 on this page: http://forum.xda-developers.com/android/development/ufficial-thread-lenovo-k3-note-t3102997/page8
Had a good play with the phone over the weekend. I've installed CWM, rooted and put on Xancin's AOSP v3 ROM: http://www.movilesdualsim.com/tema/custom-rom-aosp-v2-anadida-revision-v3.101635/
So far everything seems pretty good. The real issues that I've noticed so far are:
1. Notification LED does not work. It lights up when charging but otherwise nothing. This is a known issue on all K50 Roms unfortunatley and yet to be solved. You can still get notification sounds.
2. Touch capacitive buttons are not back lit. They never were!
3. BBC iplayer freezes when it tries to stream tv. It plays downloaded programs ok. Catchup TV app works fine though.
4. I couldn't get ringtones to work to start with. Seems you have to have vibrate and ring turned on to get the ringer to work.
5. After a call the screen stayed black until I pressed the home button. I think this is a known issue on all K50 roms
These are all issues I've noticed on the custom ASOP V3 ROM. I haven't tried them on the official VibeUI rom.
My Lenovo K3 Note has arrived!
Ordered from here: http://www.to2c.com/lenovo-k3-note-2g-ram-16g-rom.html
I used free European registered post option which was actually Netherlands post. It took 11 days to arrive, no customs charges.
I took the option to2c.com offer of them repacking it without the box. The idea is that it looks less like a new complete purchase that might attract custom charges.
Their re-packing was excellent, probably better protected that the original box. They also included a free car charger and OTG cable (as well as the free case/glass screen protector stated on the web site). They installed Google Play and removed most of the Chinese apps. I would definitely use them again. Tracking data for the package worked after about 5 days and was very good. The postage sticker marked the package as "Phone" with the value of $20.
Not had much of a chance to play with the phone yet. Plenty of reviews on the web give lots of detail so I'm not going to write much here.
It feels like a well built phone (comparing it to my Nexus 4).
GPS fix in the UK took seconds.
Camera seems pretty good.
Screen is great.
I don't like the Vibe OS is comes with but there is an AOSP rom in development on root / custom recovery details here so I'll flash it to that I think http://forum.xda-developers.com/android/development/ufficial-thread-lenovo-k3-note-t3102997
I've also seen detail of an unofficial Cyanogenmod 12.1 ROM in development so fingers crossed for that one.
Mine is in transit. It's coming with a "free" case and screen protectors too. In the reviews on the to2c.com the sellers were promising to send free car chargers and other goodies with it too if the buyer had requested it. Not sure how true that it though. Hope to receive it next week. Still looking to see if I can find a pure android rom somewhere.
No, it was listed as a free postage option. I could have chosen Singapore HK post as well but the estimated delivery time was much longer. I don't know if EU airmail option is more likely to incur customs charges though. I took the option that to2c.com offer of repacking the phone without the original box so it looks less like a complete new purchase (supposed to help stop customs charges, and knocks $1 off the final price :) ) and they said they would mark the package as low value.
Spemall are selling the 2GB version too for that price http://www.spemall.com/JIAYU-S3-4G-SMARTPHONE-MTK6752-64-bit-Octa-Core-5-5-Inch-FHD-13MP-Camera-3000mAh-NFC-RAM-3GB-RAM_g.html Not sure how good a seller they are but they are often mentioned on gizchina.com . They often do discount promotions with them. $5 off etc..
Anyway my order with club1941 just doesn't feel right so I've cancelled. Too many issues around the whole deal.
Club1941 has turned out to be a scam site. http://forum.xda-developers.com/general/general/experience-comments-club1941-t3043990/page21
I've deleted my previous posts about ordering from them so people don't part read the posts and try and order from them.