Class T vs. Class D Digital Amps

Hi folks. I'd love to hear some people weigh in with a layman's description/comparison of these two technologies. I'm particularly interested in how Channel Island's Class D amps might compare to Audio Research's Class T gear.

How do these technologies compare? How does the use of these technologies alter other aspects of amplifier design like power supplies, transformers, etc.? What are some limitations to using this technology for amplification? Other than efficiency and cool operating temps, what are some other benefits here? Anyone think this is the wrong direction to be going?