Can't vouch for how easy they are to install, but can add a bit of info on the company that built it - or rather the inventer.
In Australia there is/was some kind of prize for $20000.00 (from memory it was some sort of young inventor type competition) and the bloke who invented the opal vision card won this prize. His next step was the roaster - he sold a ton of opal visions based on a promise to deliver extra functionality that never arrived. There was a stack of upset customers down here.
I know it's a bit vague - it was many years ago.
Bit more here :
http://www.airguns.com.au/air-guns-articles/2004/4/28/young-guns/
