Quoted from PanzerFreak:I've had a WOZ since Oct 2013 and its been very reliable, no light board issues.
If you buy a WOZ I would recommend buying one made Sept 2013 and going forward as those have the 7.5 light boards. The games that are prone to light board issues were the early ones using 5v boards. 7.5v game's can have issues but I haven't heard of many.
It seems like most owners of games with 7.5v unbuffered boards and 7.5v buffered boards haven't had issues. The games with 5v boards likely exhibited issues years ago and have hopefully had boards replaced.
There are multiple revisions of the WOZ light boards
1. 5v original light boards
2. 7.5v unbuffered, started Sept 2013
3. 7.5v buffered, not sure on date
4. 2.0 board system
Again, this information is not accurate. There are 5v buffered boards that have the daughterboards attached that buffer them. They are considered by JJP to be as reliable as any buffered or unbuffered 7.5 board. It isn’t an issue of 5v vs. 7v. The issue is whether they are buffered or not.