The rubber eyelets broke after a couple uses, so I sent them back and upgraded to to their kts aluminum crampons. (Kahtoola was great to deal with). Never looked back since. They are a thousand times better. I wear them a lot, and they are wearing out, so I'm debating on trying their steel K10 option.
If anyone is looking at buying some Microspikes, Campsaver has a coupon code (TRAKS14) for 20% off them plus free shipping good until 11-11-14. I just paid $51.96 for a pair.