A couple years ago I used tons of them for changing out ballasts at a huge office building. We used the orange #85's. They were very quick and appeared to make a strong connection, better than a lot of quick connectors like you often see with ballasts or exit signs. I don't remember being able to remove the wire from them after installation, I believe you have to cut it off. It was great for ballast changes, but I wouldn't use them for regular splices where you intend to change or add wiring in the near future.
