I have a pair of the Armadillo tires for my road bike, and they've helped quite a bit (we have a lot of thorny plants in my area, see my question here).

The downsides to this tire as compared to the tire that came with my bike:


The Armadillo is much skinnier than my previous tire (my choice, they do have larger sizes)
The Armadillo has less tread than my previous tire - I can go faster, but I have to be careful in wet conditions, as this tire can slip a lot easier. I've found riding in sand/dirt/loose gravel can be nearly impossible, depending on how loose it is. I have the All Condition tire.
Because the Armadillo has the thick (I think it's Kevlar) weave, it doesn't flex as easily. This makes your tire want to "skip" off of objects, instead of flexing and rolling right over them.


That said, I do prefer the Armadillos over my stock tires - since switching, I haven't had a single flat, and I've put about 500 miles on them so far (riding through the same areas where I got punctures before).

What are the disadvantages of "puncture proof" (or puncture resistant) tires?
I know that black holes are "black" because nothing can escape it due to the massive gravity, but I am wondering if there are any theories as to what happens to the light or mass that enters a black hole and cannot escape. 
