This is must have in the toolbox! I'm building my motor, pulled the head, upgrading springs and camshafts. This definitely made it easy to release the keepers and install, I've seen other methods that work but this made life easy. Great design!
I used it on 2012 ej25 heads, so easy to use. Well built product for the price.
Tool worked great on my 07' STi, I wouldn't say it is for a high production shop type application but for an occasional use tool it works very nice.