I just got this email from Onshape:
Thank you for participating in Onshape's Beta Program!
Your usage and feedback has been instrumental in helping steer everything about Onshape – from the product roadmap and infrastructure to our support and community programs.
In recognition of your contributions, we would like to extend an invitation to our Beta Thank You Program. Between now and December 31st, 2015, we are offering users that signed up for Onshape during the Beta period, two free months of our Professional Plan.
How does it work?
To participate in the program, upgrade to a yearly subscription before December 31, 2015, and you will receive two additional months for free.