The build quality of the Asus T100 Chi is far above that of the T100TA's. There is no comparison. I have tried out the Acer Switch, the T100TA, the Lenovo Yoga 10, the Dell Venue 8 Pro, and the cheap HP Stream 7. The Chi is better than the lot of them. The feel of the device is exceptional like an IPhone or IPad.
The tablet portion is an all solid metal build with a very bright (over 450 nits) full HD plus 1920x1200 screen. It can run a HD video for about 12 hours continuous on one battery charge. It is designed to use the faster charging 9V power adapter and it can also charge from a smartphone charger at twice the charge time.
The Chi can be easily used on a lap or held in your hands. The magnetic latch is very strong and holds the device together firmly. The new Surface 3 does not work well on a lap. The three position kickstand is not well designed for lap use according to one reviewer. The Chi can be used in laptop, tent, stand, and tablet modes like the Acer Switch or Yoga laptop series. Because the keyboard uses bluetooth, the tablet and the keyboard can be separated. BTW, the keyboard battery lasts for days on a charge.
The proper comparison should be toward the Surface 3 with 2GB of ram, 64GB of storage, and the Atom X7 processor. With a keyboard and pen, the Surface 3 hits $680. The Chi is less than $480 with pen. With more memory, storage, and better processor, the Surface 3 gets very expensive.
I got the Chi at the local MicrosoftStore. I did not want to spend $200 more for a device that would not be stable on my sofa arm or lap. I had used the Lenovo Yoga Tablet 2 10 for a month and had major problems using the tablet with kickstand and bluetooth keyboard in various situations.
Performance wise, the T100 Chi got a PCMark 7 score of 2772, the Surface 3 got a 2839. The T100 Chi ATTO max read/write speed is 176MB/s, 76MB/s. The Surface 3 speed is 163 MB/s, 39MB/s. So it seems the better X7 CPU is offset by the slower disk access.