Anyone use Sanwa sdm-18 buttons?

[Well Fed Games]

Ok, so I am committing the mortal sin of cramming three buttons into a CP area that should really only hold one, and am considering the sanwa sdm-18 buttons (18mm). Anyone ever use them? Would they be ok for main buttons if space is really an issue (and it really is)?

[BadMouth]

Man 18mm is tiny. 

I have 24mm ones for admin.  I mocked up a panel to try them as the main buttons.
It felt fine for one or two button games.  I'm sure it would be fine for a game that occasionally uses the third.
On fighters, it felt like typing on a keyboard.

I've never had a sdm-18, but from the pictures it doesn't look like it uses they same type of switch as the 24 & 33mm buttons.
That concerns me.  Might just have to order one and see what the action is like. 
If it feels like a momentary pushbutton from radioshack, it's not going to work very well as an arcade button.

[Well Fed Games]

yeah, they do look like a different design. Maybe i will go with some 24mm buttons. Thanks.