Default [Q] How well to Sol Republics respond to button press?

How well do the 1-button Sol Republic earbuds sold on Moto's website respond to the button press?

I bought a pair of iKross earbuds with a single button and the earbuds respond only sporadically to the play/pause commands on the inline cord button.

Are the Sol Republics more consistent? Are there any disadvantages to getting the 3-button Sol Republics instead in case I upgrade in the future?