It hasn't worked out so well for them. I visited their booth in 2009, and they showed a large flexible screen housed in a rigid case. It was to be the advent of flexible e-ink, and the beginning of a new era. Eventually, their announced content partners fell through, and despite an initial splash it never really materialized.
Plastic Logic did launch in the US, but shut down their US ops in 2012. [1] They are still a going concern, however, and still focusing on the business market.
[0] http://www.slashgear.com/plastic-logic-que-wireless-ebook-re... [1] http://www.ft.com/intl/cms/s/0/1a08be60-9eba-11e1-9cc8-00144...