About the security question....
I used Android tablets for "content consumption". Video, music, basic web browsing, ebooks, comics, Angry Birds etc. But secure? Absolutely not and it doesn't matter if it has a lockscreen on it or not. If you lost the device, a thief with some moderate tech skills will be able to get into your device, and eventually your data. This is especially the case with rooted devices, but even on stock it's certainly possible since the recovery image does not require a signed update. The data partition is not locked down, and the /sdcard partition uses FAT32 which has no security at all.
Stock is also affected by the "DroidDream" vulnerability (google it) which Viewsonic has yet to address. I have asked them many times about this, and I have been ignored so far.
I would never use my Android tablet for Banking or anything else where financial information is involved. The farthest I've gone is Facebook and forums, but those are things where I could change my password quickly, in a pinch.
Android, imo, is on par with a Windows 98 device - it has the illusion of security, but it's really just a smokescreen. Take it for what it's worth.