In mid-December, I purchased a product called TAP, a "wearable keyboard
and mouse." It is a 5-ring banded device that sits on one's knuckles, and
allows one to type with finger chords and scroll with palm gestures. The
construction of the device is from five accelerometers placed in each
ring.

I purchased the TAP with the intention of developing for it, to read the
accelerometer data. I wanted to know how I was throwing a bowling ball,
and wanted to tune my consistency during throws. To my surprise, their
developer's documentation offers only the highest-level of interfaces,
giving only finger-index positions and the duration of a tap. In order
to do what I wanted to do, I need proper device access.

I contacted the company several times over the next month: either give
deeper developer access, or let me return the item. Nobody responded on
the Amazon merchant page, so I sent an email, then another, then called
them, then sent an email to the person listed on their WHOIS record
(tapwith.us), and eventually called Amazon to resolve the issue.

A support woman offered to call TAP about the problem, and they spoke
to someone while I was on hold. Then, I was able to get a return label
for the product.

I feel that TAP could have been a useful tool for many finger-sensitive
tasks, like bowling or other sports. The device retailed for $179, which
is expensive for a 32-character keyboard that requires an operator to
learn fingerings. However, it's an appropriate price for a hobbyist who
wants to learn to bowl better. Unfortunately, they lost a customer.