Ask HN: is MEGA safe to use? Any reasons to stay away?

Many of us are concerned and on the look out for a dropbox/skydrive replacement.

Wuala is #1 on HN right now: https://news.ycombinator.com/item?id=5853159 ... and I'm sure many others will follow.

In the meantime, I wanted to ask HN: is there any legitimate reason NOT to start using MEGA (https://mega.co.nz/) now? 50GB free, all data is encrypted, we hold the keys (https://mega.co.nz/#privacycompany).