Titleist 620 MB
What it is: A full set of forged muscle-back blades. 4 through pitching wedge. No cavity, no perimeter weighting, no help.
Why I play them: Feedback. When I catch one out of the middle it feels like nothing at all, and when I miss it by a groove I know instantly and exactly where. That information makes me a better ball striker. I also flight them lower and work them both ways more easily than anything cavity-backed I have tried.
How long: Four seasons. Regripped twice, never thought about replacing them.
Honest take: Blades are not for everyone, and I mean that. If you are above about a 10 handicap these will punish you on every strike that is not centered, and you will lose real distance on the toe. You should play these if you hit the middle of the face most of the time, your miss is small, and you actually want to feel the bad ones. Almost everyone else scores better with a players cavity or a game improvement iron and should feel zero shame about it. Ego costs strokes.