Bought this paying cash from Best Buy as lenovo.com did not accept debit cards. I was disappointed that all their (Best Buy) Yoga 3 models only had windows 8.1 basic. I bought the 512GB model. I wish the power button was recessed to prevent accidental push sending it into sleep when in tablet mode, when resting on your lap. You can rotate the tablet around to avoid that of course. I have no cpu speed issues, and have not heard the fan at all, even with running software to test and stress the cpu (Intel Thermal program was active/enabled in bios). This convertible feels snappy. Firefox with a bunch of addons runs great, as well as every youtube video I clicked. I like the fact the back cover has screws. Its better then prying, and risk breaking something to replace the battery in the future or upgrading/replacing the SSD. The SSD has a lot of partitions on it, and I am not sure what they are all for yet. The Yoga 3 also came with some bloatware. I needed to google all the software names to know what to keep and loose and it took about 30 minutes to uninstall. The Yoga 3 feels sturdy, and is very light. The screen brightness has a very large range from very bright to very dim (if you set it to manual in windows and use the function keys). Allot of my older programs have tiny fonts even with windows compatibility dpi settings enabled, so in a way its almost too much resolution. I have no issues with the keyboard. The only game I have tested out is Europa Universalis IV which plays fine. The SD card slot on the side is a short one (shallow), so I am currently looking for a short or half size micro scdard adapter to avoid the sdcard sticking way out. No hotspots on the bottom when in laptop mode, just slightly warm (not a uncomfortable warm) in one area after doing something cpu intensive. Back-light keyboard is a nice luxury, and the large touch pad works great. The Yoga 3 uses a usb cord with one end that has a special notch for power. The power adapter is 120-240v input and output is 20v 2A or 5.2V 2A according to the label on it. I did try to use the usb power cord that runs from the ac adapter to a special usb slot and plug the normal usb end into a "juice box" that I have for my mobile phone (output 5V) - it did not charge or transfer power to the tablet when I tried. I guess if you running out of battery you will need to find a ac plugin, and have the adapter plus the special usb power cord with you rather then a battery box. I would recommend this Yoga 3 for business persons - spreadsheets, word, internet, email and presentation. If your a high end user or gamer you may want to wait until someone finds out what plays nice and reports. This convertible may surprise you on what it can run mind you its size. Keep in mind I don't think it is supposed to compete with your desktop computer. The wifi AC and Bluetooth 4.1 both work great. There is a recessed button near the power button to get to BIOS settings when powered off. Not a whole lot to play with in there- fairly basic.Disclaimer- I run windows with windows appearance settings set to low (performance), no pagefile, no antivirus/defender, updates or system restore in use or running. Also I deleted allot of stuff at startup using the program autoruns, as well as most bloatware. It may have a effect on my performance. A good effect. Recommend to get it best deal at: Seebestdeals.com/?p=1737Hope it helps.