There was an article in regards to carbon-plated racing shoes. The last point is in regards to how often one should train in carbon-plated shoes (and, to me, this can be applied to carbon-plated super-spikes):
".....How often should you train in your racing shoes?
This has been a popular topic as more brands have unveiled their carbon-fiber racing shoes and people enjoy running in them so much they want to wear them every day. In general, you shouldn’t train a lot of miles in the specific shoes you’ll be
racing in for a couple of reasons. First, the midsole foam material won’t be as springy and responsive on race day if you’ve logged a lot of miles in them. If you like the feel of your race-day shoes and want to wear them often, you might consider buying a second pair to wear on occasional training runs.
The second reason not to wear them every day is that shoes with rigid carbon-fiber plates don’t allow for natural dorsiflexion of your foot (upward turning of your
toes). Although research is lacking so far, some elite and age-group athletes suggest training too many days a week in carbon-fiber racing shoes can lead to numbness in the forefoot, strained calf muscles, and Achilles tendons, and stress reactions in the plantar tissue under the feet.
In addition to injury risk, Samantha Cocca, an athletic trainer and strength and conditioning
coach in Denver, cautions runners not to wear super shoes every day in training because running in such stiff shoes could weaken the muscles under their feet and toes since the shoe is providing much of the propulsion. “It’s great when
you’re running in the shoes, but the second that you’re not running in the shoes you’re just creating a stress you’re hiding in these shoes,” Cocca says.She suggests wearing them no more than twice a week for a long run or a speed workout. Cocca adds that anyone who wants to train or race in super shoes better be doing drills to strengthen their plantar fascia and the muscles in their toes. You need to strengthen your toes so that you’re able to generate your own force, she says, and can then create more propulsion through the shoes....."
Ms Cocca helped me through an injury, and I highly respect her knowledge given her background.