Whats everybodys opinion on them? I have 2 laying around and would like the simplicity over the Crane ignition setups. Can they handle 850hp?

they will handle that no problem...but they have no rev limiter so you would need to a seperate box for that...

I have been running one for 4 years, no issues.

No such thing as ready to run in a performance engine ! It will need to be set up for YOUR personal needs . just my .02

I understand but there ready to run as in no box or coil needed.