Bug
Visible ripple effect in all positions
Md-step cut off ripple effect of checkbox close to edges
"@angular/animations": "^4.4.4",
"@angular/cdk": "^2.0.0-beta.11",
"@angular/common": "^4.4.4",
"@angular/compiler": "^4.4.4",
"@angular/core": "^4.4.4"
"@angular/material": "^2.0.0-beta.10",

This is caused by the CSS rule in stepper:
.mat-horizontal-stepper-content {
overflow: hidden;
}
Since the mat-checkbox is sitting in the upper left corner of the space of the stepper's content, it does not show the ripple overlay as they do not offset space. An option would be to put a margin around the mat-checkbox to create the offset space needed.
weak hack
.mat-horizontal-content-container {
padding: 0 20px !important;
margin: 0 -20px !important;
}
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