I have two devices with lifetime (RM 1 + 2)
RM was very generous giving it to all devices bought before the service came out.
It's only $5/mo iirc w/ no hard limits, not a bad deal to sync your docs, pdfs, and books tbh.
Are you affiliated with the company?
I just like the product and thought the free lifetime was nice.
Would be nice to work there for a year or so to implement a wishlist of features for the OS though.