I have a 4 year old pair of k-3s. Love them. They've been up most of the Tetons including once in winter conditions. They handled the ice,snow and moderate technical rock with no problems and my feet were reasonably warm. I've worn them on Ranier and again had no problems although steep descending in any stiff boot gets old real fast.
I always choose them over my plastics for local vertical ice. Unless I go real high, these are the boots I'll take.

Customer Service

No need in 4 years

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plastics

I was a little scared to buy these considering that they are stiffer and thicker than the Makalu that get so much whining about the break-in period. I tried on a few sizes, settled on a 42.5 that fit perfectly. I've had mine for about a month now and have worn them every day to get them broken in. They now fit like nothing I've ever worn. Very comfy. Very warm. Great support (you physically cannot roll your ankle even if you try to). The lacing system is top notch. I can't wait to step into some crampons and try them for climbing. I'm told that they are great alternative to plastics for vertical ice.

Customer Service

No experience yet, but when I do, La Sportiva USA is just up the road in Boulder, so I expect great service (in person).

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None really. This is my first real set of mountainerring boots.

These boots are great. LIght, nearly as warm as my plastic double boots, climb ice like fiends. Haven't been able to climb any rock with them yet. A bit narrow in the toe, but okay for my foot. These are stiff high-mtn. boots, not strolling shoes. the cuff is flexible enough so the stiffness isn't too bad.

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La Sportiva K3
Scarpa Invernos