I purchased this to replace the stock Zippyy stick that comes with the Pimoroni Picade kit.
It's a easy replacement, the holes are all in the correct place (default SE mounting plate).
I was hoping for a looser more fluid feeling joystick that wasn't as clicky. This joystick is slightly looser and feels better than the Zippyy, but it's not a massive difference. It is a bit less clicky too. This makes playing shooters etc more enjoyable. What I did find is that it actually makes playing Pacman LESS precise, as it's now easier to move the joystick diagonally - I guess I could use the restrictor plate to limit the joystick to 4-directions, but it would be a hassle to keep opening the cab to move the restrictor plate depending on what game I was playing.
So I guess it's a bit of a trade off - if you want a smoother, more fluid 8-way joystick experience, then get this. But if you're playing the early 4-way joystick classics, then you might be better with a cheap clicky stick.
It's still not massively loose feeling, but I guess you can replace the spring to get that if required.
Oh yeah, and I was hoping that the included joystick ball wouldn't have a seam, but unfortunately it does.
It's gone up in price since I bought it (I paid £15 inc VAT).
Certainly, a decent improvement over a stock joystick but you'd probably get a better bang-for-your-buck improvement replacing cheap buttons with premium ones first.