All current donating members will be grandfathered into the paying member group for one year. After that, a 1 year subscription will require a min $20 donation.
Current donation amount is whatever you feel the forums are worth to you. If you think you have received $5 worth of information, feel free to donate $5. If you think they are worth far more then that, feel free to donate that much.
The subscribers will receive a lot more then just a no-ad's version of the forums; they will have access to a lot of additional features and benefits as well.
I hope to have more details soon, but don’t expect the subscription model to go into effect for another few months.