The Breda glass cutters have been developed for mosaicists by American mosaicist Candace Clough for use only on glass materials from 2 to 10mm. They are extremely lightweight, need a lot less pressure to use, with a force leverage of between 5 and 6 times. They have changeable heads for left or right handed use and have other cool features such as numbered wheels so you know which part of the wheels have already been used.
And here is a review by Peter Twining.